| Country of previous citizenship | 2010 | 2011a | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 |
|---|
| Europe | ||||||||||
| Austria | 4 | 20 | 14 | 9 | 7 | 10 | 5 | 8 | 7 | 6 |
| Greece | – | 1 | 2 | 2 | – | 2 | 2 | 1 | 7 | 15 |
| Germany | 25 | 55 | 67 | 35 | 59 | 29 | 15 | 38 | 50 | 59 |
| Bulgaria | 23 | 9 | 7 | 6 | 5 | 3 | 3 | 8 | 29 | 3 |
| Czechia | 76 | 16 | 9 | 7 | 17 | 7 | 5 | 2 | 6 | 6 |
| Estonia | 19 | – | 1 | – | 1 | – | – | 1 | – | – |
| Croatia | 26 | 61 | 50 | 22 | 27 | 15 | 14 | 12 | 17 | 12 |
| Poland | 9 | 27 | 18 | 11 | 45 | 15 | 18 | 22 | 19 | 21 |
| Romania | 3 939 | 15 658 | 14 392 | 6 999 | 6 200 | 2 605 | 2 874 | 1 757 | 2 123 | 1 822 |
| Slovakia | 97 | 414 | 307 | 202 | 310 | 208 | 282 | 136 | 223 | 260 |
| EU28 | 4 238 | 16 296 | 14 903 | 7 333 | 6 708 | 2 925 | 3 271 | 2 026 | 2 534 | 2 299 |
| Russia | 111 | 168 | 151 | 97 | 170 | 131 | 119 | 75 | 89 | 93 |
| Switzerland | – | 1 | 7 | 4 | 6 | 3 | 6 | 3 | 2 | 6 |
| Serbiab | 721 | 1 678 | 1 330 | 647 | 410 | 158 | 144 | 93 | 105 | 88 |
| Turkey | 9 | 12 | 8 | 20 | 58 | 19 | 20 | 23 | 20 | 26 |
| Ukraine | 646 | 2 189 | 1 765 | 894 | 858 | 386 | 365 | 186 | 192 | 142 |
| Other European | 127 | 12 | 12 | 13 | 19 | 13 | 7 | 6 | 13 | 18 |
| Together | 5 852 | 20 356 | 18 176 | 9 008 | 8 229 | 3 635 | 3 932 | 2 412 | 2 955 | 2 672 |
| Asia | ||||||||||
| Afghanistan | 24 | 4 | 5 | 2 | 5 | 13 | 11 | 9 | 11 | 8 |
| Iraq | 3 | – | 6 | – | 4 | 5 | 5 | 8 | 4 | 7 |
| Iran | 14 | 7 | 14 | 11 | 16 | 10 | 21 | 10 | 11 | 21 |
| Yemen | 4 | 3 | 8 | 7 | 10 | 5 | 9 | 3 | 3 | – |
| Jordan | 2 | 1 | 3 | 2 | 18 | 7 | 2 | 2 | 6 | 3 |
| Kazakhstan | 3 | 3 | 3 | 5 | 6 | 8 | 3 | 5 | 3 | 2 |
| China | 27 | 15 | 3 | 7 | 13 | 12 | 15 | 14 | 12 | 4 |
| Lebanon | 1 | 1 | 3 | – | 8 | 3 | 1 | 3 | 5 | 4 |
| Mongolia | 16 | 18 | 9 | 8 | 20 | 18 | 13 | 19 | 28 | 12 |
| Syria | 10 | 7 | 11 | 10 | 57 | 21 | 11 | 21 | 15 | 13 |
| Vietnam | 75 | 38 | 29 | 15 | 67 | 39 | 36 | 46 | 87 | 100 |
| Other Asian | 16 | 36 | 23 | 29 | 49 | 50 | 49 | 41 | 54 | 48 |
| Together | 195 | 133 | 117 | 96 | 273 | 191 | 176 | 181 | 239 | 222 |
| America | ||||||||||
| United States | 2 | 17 | 13 | 9 | 25 | 13 | 17 | 10 | 17 | 25 |
| Cuba | 5 | 5 | 7 | 2 | 14 | 9 | 10 | 2 | 3 | 5 |
| Other American | 4 | 20 | 16 | 13 | 38 | 40 | 18 | 18 | 66 | 168 |
| Together | 11 | 42 | 36 | 24 | 77 | 62 | 45 | 30 | 86 | 198 |
| Africa | ||||||||||
| Algeria | 12 | 1 | 5 | 1 | 19 | 11 | 4 | 7 | 6 | 8 |
| Egypt | 3 | 2 | 6 | 9 | 81 | 93 | 101 | 119 | 191 | 103 |
| Libya | 1 | 1 | 1 | 1 | 4 | 2 | 3 | 1 | 2 | 5 |
| Nigeria | 5 | 3 | 9 | 5 | 15 | 13 | 11 | 7 | 5 | 7 |
| Sudan | – | 1 | 4 | 2 | 2 | 3 | 1 | 5 | – | 2 |
| Other African | 7 | 13 | 24 | 31 | 43 | 36 | 35 | 24 | 21 | 37 |
| Together | 28 | 21 | 49 | 49 | 164 | 158 | 155 | 163 | 225 | 162 |
| Other and unknown | – | 2 | 1 | 1 | 2 | 2 | 7 | 1 | 3 | 1 |
| Total | 6 086 | 20 554 | 18 379 | 9 178 | 8 745 | 4 048 | 4 315 | 2 787 | 3 508 | 3 255 |