How to Measure a Risky Harvest: Volatility Explained Simply
Every crop has an average harvest and a different degree of surprise. The coefficient of variation (CV) compresses a decade of annual production into one comparable number: the standard deviation around the average, expressed as a percentage of that average. A CV of 30% means a typical year lands about a third above or below the mean; a CV of 5% means the harvest barely moves.
Measured this way over 2015-2024, the EU-27's wildest sizeable harvests are blueberries at 31.3%, raisin grapes at 30.0%, tobacco at 26.1% and satsumas at 23.0%. Each number comes from the same Eurostat table (dataset apro_cpsh1), so they are directly comparable.
One honest caveat: CV mixes trend with volatility. A fast-growing crop like blueberries scores high partly because its average keeps moving; a fading crop like tobacco swings around a falling line. Read the CV as "how surprised a buyer gets", not as a weather index.
CV = coefficient of variation of EU-27 annual production, 2015-2024, dataset apro_cpsh1.
| Crop | EU-27 CV 2015-2024 | Volatility grade |
|---|---|---|
| Blueberries (F3300) | 31.3% | Volatile |
| Grapes for raisins (W1300) | 30.0% | Volatile |
| Tobacco (I3000) | 26.1% | Volatile |
| Satsumas (T2100) | 23.0% | Highly volatile |
| Strawberries (S0000) | 3.2% | Very stable |
| Beetroot (V4300) | 3.1% | Very stable |
The Watchlist: Four Crops, Four Kinds of Swing
Blueberries are the boom wildcard. EU output multiplied over the window — a compound growth rate of about 14% a year from 2016 — reaching 190 280 tonnes in 2024 after a 195 220-tonne peak in 2022. The volatility is geographic: Poland (62 000 tonnes, 32.6%) and Spain (60 950 tonnes, 32.0%) are near-tied leaders, so a bad year in either reshuffles the EU total.
Raisin grapes are the spikiest series. From a 218 680-tonne EU peak in 2017 the harvest crashed to 100 820 tonnes by 2019 — and the EU aggregate series breaks after 2020. In 2024 Greece still reported 111 100 tonnes of the EU-27's 112 940 tonnes: 98.4% from a single country, the most concentrated position on this list.
Tobacco declines with drama: from 196 260 tonnes in 2015 to 102 190 tonnes in 2024, net -47.9% (about -7.0% a year), bottoming at 89 780 tonnes in 2023. Satsumas swing around a slide too — from a 183 560-tonne high in 2018 to 119 230 tonnes in 2024, with a 93 870-tonne floor in 2023, led by Spain's 103 210 tonnes (86.6%).
EU-27 production extremes in the 2015-2024 window (1 000 t). Raisin-grape and blueberry highs/lows include member-sum years where the aggregate is missing.
| Crop | Window high | Window low | 2024 (1 000 t) | Top producer 2024 |
|---|---|---|---|---|
| Blueberries | 195.2 (2022) | 66.9 (2016) | 190.3 | Poland 32.6% |
| Raisin grapes | 218.7 (2017) | 100.8 (2019) | 112.9 | Greece 98.4% |
| Tobacco | 196.3 (2015) | 89.8 (2023) | 102.2 | Italy 33.2% |
| Satsumas | 183.6 (2018) | 93.9 (2023) | 119.2 | Spain 86.6% |
Fruit-Bowl Impact: What Volatility Does to Availability
For a shopper, volatility shows up as "this year's berries cost more" or "the raisin pack got smaller". The two fruit entries on this list sit exactly in the seasonal-buyer zone: blueberries are a supermarket staple whose EU supply can shift by a quarter between seasons, and satsumas are the classic winter citrus, 86.6% Spanish.
The concentration-volatility combination is the real risk multiplier. Greece supplies 98.4% of EU raisin grapes and swings 30% around its average; Spain grows 86.6% of satsumas inside a declining, oscillating series. One country's weather year is, statistically, the EU's weather year.
Tobacco and raisin grapes also carry trend risk: both series lose roughly 40-50% of volume across the window. For small buyers, a shrinking-and-swinging crop means fewer suppliers to switch between in a bad year.
The concentration × volatility matrix for the four watchlist crops, 2015-2024.
| Risk dimension | Blueberries | Raisin grapes | Tobacco | Satsumas |
|---|---|---|---|---|
| Top producer share | 32.6% (PL) | 98.4% (EL) | 33.2% (IT) | 86.6% (ES) |
| CV 2015-2024 | 31.3% | 30.0% | 26.1% | 23.0% |
| Direction of trend | Booming | Shrinking | Shrinking | Shrinking |
Steady Anchors: the Crops That Never Surprise
The contrast makes the watchlist meaningful. Among EU crops averaging at least 500 000 tonnes a year, the steadiest harvests are beetroot (CV 3.1%), strawberries (3.2%), lettuces (3.5%), small citrus fruits (4.0%) and muskmelons (4.1%) over the same 2015-2024 window.
The difference is an order of magnitude: a beetroot buyer plans around a number that barely moves, while a blueberry buyer plans around a range. Strawberries — a fruit crop with a reputation for fragility — are in fact among the EU's most reliable series, a useful reminder that "perishable" and "volatile" are different properties.
For a small retailer or processor, the steady anchors are the default shelf: predictable supply, predictable costing. The watchlist crops need contracts and buffers — which is exactly the information this ranking exists to deliver.
The steadiest EU crops averaging at least 500 thousand tonnes per year, 2015-2024.
| Steady anchor | EU-27 CV 2015-2024 | Average annual volume (1 000 t) |
|---|---|---|
| Beetroot | 3.1% | 805 |
| Strawberries | 3.2% | 1 188 |
| Lettuces | 3.5% | 2 327 |
| Small citrus fruits | 4.0% | 2 987 |
| Muskmelons | 4.1% | 1 786 |
Practical Tips for Small Retailers and Processors
Three working rules follow from the data. First, sort your suppliers by the CV of their crop, not by price alone: the four watchlist crops deserve a second source or a buffer stock, the anchors do not. Second, watch the leader, not the union — with 98.4% raisin grapes in Greece and 86.6% satsumas in Spain, the national harvest estimate is the supply forecast.
Third, separate trend from swing: tobacco's -47.9% decade decline is a sourcing exit signal, while blueberries' +14% a year growth with 31% swings is a growing-market-with-bumps signal. The CV alone would rank both as "risky", wrongly.
All numbers in this watchlist can be re-checked in Eurostat dataset apro_cpsh1 — filter crop, EU-27 and the 2015-2024 window, and the CV math is one spreadsheet formula away.
The watchlist in one table: volatility, direction and the practical sourcing read, 2015-2024.
| Watchlist crop | CV | Decade direction | Suggested posture |
|---|---|---|---|
| Blueberries | 31.3% | +14%/yr growth | Grow with the market; buffer the swings |
| Raisin grapes | 30.0% | Shrinking | Single-source risk — secure contracts |
| Tobacco | 26.1% | -7.0%/yr decline | Exit or niche sourcing |
| Satsumas | 23.0% | Shrinking | Spanish-estimate dependent |
Frequently Asked Questions
Which EU crop has the most volatile harvest?
Among sizeable EU crops, blueberries: the EU-27 harvest varied with a CV of 31.3% over 2015-2024, from a 66 920-tonne low in 2016 to a 195 220-tonne peak in 2022.
How is harvest volatility measured?
With the coefficient of variation (CV): the standard deviation of a crop's annual EU production over a window, divided by its average, in percent. Higher = more surprising years.
Which EU crops are the most reliable year to year?
Among crops averaging at least 500 000 tonnes a year: beetroot (CV 3.1%), strawberries (3.2%), lettuces (3.5%) and small citrus fruits (4.0%) over 2015-2024.
Which crops on the watchlist are also shrinking?
Tobacco (-47.9% net over 2015-2024), raisin grapes and satsumas — only blueberries grow (+14% a year), which makes their 31.3% CV a growth-with-bumps signal rather than a decay signal.
Source data extracted from Eurostat dataset apro_cpsh1.
This article was generated using AI. The content is based on Eurostat data and is provided as a starting point — please verify all data with the original source.
