Full Professional Members
| 2020 | 2021 | |
| Estonia | 7 | 9 |
| Germany | 501 | 435 |
| Greece | 43 | 42 |
| Hungary | 89 | 89 |
| Italy | 264 | 252 |
| Latvia | 39 | 46 |
| Netherlands | 103 | 121 |
| Poland | 39 | 63 |
| Russia | 43 | 79 |
| Spain | 70 | 80 |
| UK | 353 | 355 |
| Total number | 1551 | 1571 |
Full Basic Members
| 2020 | 2021 | |
| Austria | 62 | 61 |
| Belgium | 19 | 41 |
| Czech Rep. | 10 | 12 |
| Finland | 83 | 87 |
| France | 35 | 27 |
| Israel | 348* | 378 |
| Slovenia | 6 | 6 |
| Switzerland | 79 | 72 |
| Ukraine | 112 | 112 |
| Total number | 406 | 796 |
Associate Members
| 2020 | 2021 | |
| Croatia | 10 | 15 |
| Cyprus | 12 | 13 |
| Denmark | 21 | 22 |
| Lithuania | – | 18 |
| Norway | – | 13 |
| Portugal | 10 | 11 |
| Romania | 22 | 22 |
| Sweden | 39 | 35 |
| Total number | 462* | 149 |
*including Israel (348)