| Country of previous citizenship | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 |
|---|
| Europe | ||||||||||
| Austria | 7 | 9 | 3 | 1 | 2 | 6 | 6 | 3 | 8 | 7 |
| Greece | 6 | 6 | 3 | 1 | – | 1 | – | – | – | – |
| Germany | 36 | 44 | 15 | 20 | 27 | 25 | 22 | 28 | 33 | 35 |
| Bulgaria | 45 | 20 | 7 | 9 | 9 | 14 | 11 | 5 | 4 | 8 |
| Czechia | 41 | 53 | 15 | 28 | 106 | 142 | 14 | 60 | 75 | 60 |
| Estonia | 7 | 60 | 25 | 59 | 74 | 148 | 118 | 110 | 41 | 31 |
| Croatia | 100 | 45 | 17 | 413 | 22 | 50 | 148 | 26 | 34 | 25 |
| Poland | 38 | 41 | 13 | 20 | 17 | 26 | 10 | 10 | 14 | 13 |
| Romania | 2 988 | 5 644 | 2 238 | 3 415 | 3 605 | 6 890 | 4 303 | 6 052 | 5 535 | 3 805 |
| Slovakia | 135 | 158 | 80 | 129 | 107 | 161 | 206 | 116 | 106 | 97 |
| EU28 | 3 410 | 6 089 | 2 419 | 4 100 | 3 975 | 7 474 | 4 843 | 6 423 | 5 863 | 4 089 |
| Russia | 207 | 202 | 66 | 91 | 87 | 162 | 111 | 7 | 156 | 119 |
| Switzerland | 2 | 5 | – | 3 | 1 | 2 | 6 | 5 | 3 | – |
| Serbiab | 1 079 | 1 254 | 470 | 343 | 533 | 949 | 357 | 757 | 758 | 672 |
| Turkey | 7 | 2 | 2 | 3 | 3 | 7 | 4 | 6 | 13 | 10 |
| Ukraine | 586 | 855 | 340 | 570 | 568 | 828 | 541 | 834 | 857 | 558 |
| Other European | 3 | 10 | 7 | 42 | 157 | 199 | 106 | 142 | 170 | 128 |
| Together | 5 294 | 8 417 | 3 304 | 5 152 | 5 324 | 9 621 | 5 968 | 8 174 | 7 820 | 5 576 |
| Asia | ||||||||||
| Afghanistan | 6 | 5 | 1 | 5 | 16 | 5 | 4 | 25 | 15 | 10 |
| Iraq | 15 | 4 | 3 | 3 | 4 | 6 | 6 | 5 | 3 | 8 |
| Iran | 9 | 4 | 1 | 3 | 7 | 10 | 7 | 11 | 6 | 18 |
| Yemen | 4 | 2 | – | 5 | 2 | 4 | 6 | 3 | 6 | 11 |
| Jordan | 4 | 9 | 1 | 5 | 1 | 5 | 1 | 3 | 6 | 2 |
| Kazakhstan | 7 | 10 | 3 | 1 | 3 | 8 | 8 | 5 | 6 | 6 |
| China | 3 | 3 | 5 | 4 | 3 | 16 | 15 | 31 | 29 | 20 |
| Lebanon | 7 | 3 | 5 | 1 | 2 | 5 | 3 | 3 | 6 | 2 |
| Mongolia | 3 | 8 | 8 | 1 | 6 | 11 | 14 | 10 | 4 | 14 |
| Syria | 17 | 12 | 5 | 13 | 7 | 13 | 13 | 22 | 17 | 11 |
| Vietnam | 14 | 17 | 5 | 11 | 10 | 53 | 40 | 53 | 95 | 39 |
| Other Asian | 12 | 25 | 3 | 17 | 11 | 34 | 27 | 22 | 32 | 29 |
| Together | 101 | 102 | 40 | 69 | 72 | 170 | 144 | 193 | 225 | 170 |
| America | ||||||||||
| United States | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 12 | 11 | 9 |
| Cuba | 6 | 17 | 4 | 6 | 4 | 14 | 7 | 8 | 11 | 4 |
| Other American | 11 | 11 | 4 | 9 | 10 | 13 | 8 | 11 | 10 | 16 |
| Together | 18 | 29 | 9 | 17 | 16 | 30 | 19 | 31 | 32 | 29 |
| Africa | ||||||||||
| Algeria | 7 | 15 | 5 | 2 | 6 | 11 | 10 | 11 | 7 | 4 |
| Egypt | 2 | 3 | – | 1 | 2 | 2 | 1 | 4 | 2 | 5 |
| Libya | 3 | 5 | – | – | 1 | 1 | 2 | 4 | 2 | 2 |
| Nigeria | 4 | 6 | 3 | 3 | 1 | 9 | 5 | 9 | 2 | 4 |
| Sudan | 1 | – | 1 | 1 | 2 | 2 | 3 | 1 | 5 | – |
| Other African | 15 | 13 | 7 | 15 | 8 | 24 | 19 | 13 | 9 | 12 |
| Together | 32 | 42 | 16 | 22 | 20 | 49 | 40 | 42 | 27 | 27 |
| Other and unknown | 1 | – | – | 1 | – | – | 1 | 2 | – | – |
| Total | 5 446 | 8 590 | 3 369 | 5 261 | 5 432 | 9 870 | 6 172 | 8 442 | 8 104 | 5 802 |