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Number of individuals from the participating countries over the study period from 2006 to 2021
| 2006–21 | 2020 | 2021 | |
|---|---|---|---|
| Australia | 8837 | 644 | 545 |
| Austria | 3024 | 268 | 288 |
| Czechia | 5148 | 461 | 490 |
| Denmark | 5085 | 330 | 330 |
| Germany | 40 272 | 3379 | 3672 |
| Italy | 16 127 | 1162 | 1521 |
| Luxembourg | 387 | 26 | 35 |
| New Zealand | 1127 | 99 | 112 |
| Norway | 5160 | 453 | 396 |
| Slovenia | 952 | 77 | 79 |
| Sweden | 11 696 | 835 | 865 |
| USA* | 3716 | 290 | 315 |
| Wales | 2759 | 185 | 205 |
The state of Colorado, USA
