| Decrease | Span | Cause | Country | % Correct |
|---|---|---|---|---|
| 5.86 m | 1994–2008 | Demographics | Russia | 89%
|
| 15–45 m | 1958–1962 | Famine | China | 86%
|
| 15.8 m + | 1993– | Demographics / war | Ukraine | 83%
|
| 3.95 m | 2012–2016 | War | Syria | 82%
|
| 5.17 m | 2010– | Demographics | Japan | 80%
|
| 3.13 m | 1979–1983 | War | Afghanistan | 72%
|
| 1.13 m | 1973–1984 | Demographics | Germany | 69%
|
| 3.58 m + | 1991– | Demographics | Romania | 68%
|
| 2.65 m | 1994–1995 | War / genocide | Rwanda | 64%
|
| 1.25 m | 1950–1954 | War | North Korea | 61%
|
| 1.56 m | 2014– | Demographics | Italy | 56%
|
| 2.34 m | 1980– | Demographics | Bulgaria | 52%
|
| 1.01 m | 1993– | Demographics | Belarus | 51%
|
| 2.74 m | 2017–2022 | Economic collapse | Venezuela | 51%
|
| 1.30 m | 1992– | War / genocide / demographics | Bosnia and Herzegovina | 50%
|
| 1.00 m | 1975–1979 | Genocide | Cambodia | 50%
|
| 1.02 m + | 1980– | Demographics | Hungary | 43%
|
| 1.19 m | 2015– | Return of refugees? | Lebanon | 40%
|
| 1.84 m | 1992–2000 | Demographics | Kazakhstan | 37%
|
| 1.45 m + | 1993– | Demographics | Moldova | 36%
|
| 1.75 m | 1989– | Demographics | Georgia | 33%
|
| 1.09 m | 1992– | Demographics | Lithuania | 32%
|
| 1.15 m | 1990–1991 | War | Kuwait | 28%
|