29 National Associations / 2.589 Members
Full Professional Members
| 2021 | 2022 | |
| Estonia | 9 | 10 |
| Germany | 435 | 420 |
| Greece | 42 | 42 |
| Hungary | 89 | 88 |
| Italy | 252 | 257 |
| Latvia | 46 | 43 |
| Netherlands | 121 | 121 |
| Poland | 63 | 44 |
| Russia | 79 | 77 |
| Spain | 80 | 75 |
| UK | 355 | 355 |
| Total number | 1571 | 1532 |
Full Basic Members
| 2021 | 2022 | |
| Austria | 61 | 71 |
| Belgium | 41 | 41 |
| Czech Rep. | 12 | 13 |
| Finland | 87 | 84 |
| France | 27 | 50 |
| Israel | 378 | 450 |
| Slovenia | 6 | 5 |
| Switzerland | 72 | 72 |
| Ukraine | 112 | 112 |
| Total number | 796 | 898 |
Associate Members
| 2021 | 2022 | |
| Croatia | 15 | 15 |
| Cyprus | 13 | 13 |
| Denmark | 22 | 20 |
| Ireland | – | 4 |
| Lithuania | 18 | 13 |
| Norway | 13 | 13 |
| Portugal | 11 | 10 |
| Romania | 22 | 23 |
| Sweden | 35 | 49 |
| Total number | 149 | 159 |