Year Internal researchers in head count Of which: females
Less than 25 years 25–34 35–44 45–54 55–64 65 years or over Total Less than 25 years 25–34 35–44 45–54 55–64 65 years or over Total
2005 394 8,480 6,872 7,606 6,653 1,402 31,407 145 3,038 2,538 2,745 2,043 222 10,731
2006 442 9,349 7,425 7,582 6,624 1,364 32,786 135 3,287 2,655 2,675 1,981 240 10,973
2007 646 9,904 7,574 7,051 6,438 1,446 33,059 185 3,436 2,705 2,499 2,004 248 11,077
2008 637 10,608 7,898 6,712 6,393 1,491 33,739 154 3,547 2,858 2,378 1,938 264 11,139
2009 887 10,935 8,766 6,739 6,365 1,575 35,267 284 3,616 2,851 2,389 1,917 266 11,323
2010 594 11,006 9,808 6,534 6,163 1,595 35,700 189 3,494 3,244 2,348 1,844 299 11,418
2011 651 11,648 10,505 6,614 5,980 1,547 36,945 214 3,517 3,519 2,330 1,879 270 11,729
2012 632 11,636 11,064 6,506 5,663 1,518 37,019 168 3,412 3,610 2,236 1,749 278 11,453
2013 699 11,676 12,140 6,729 5,361 1,198 37,803 148 3,283 3,933 2,246 1,611 241 11,462
2014 818 12,137 12,772 6,974 5,374 1,115 39,190 193 3,397 4,074 2,337 1,679 217 11,897
2015 775 11,962 12,398 6,875 5,294 1,114 38,418 162 3,352 4,016 2,351 1,749 218 11,848
2016 612 12,228 12,371 7,177 5,407 1,120 38,915 169 3,335 3,968 2,464 1,802 231 11,969
2017 863 13,129 13,772 7,927 5,758 1,280 42,729 234 3,638 4,296 2,704 1,884 268 13,024
2018 1,005 14,000 14,649 8,888 5,902 1,505 45,949 266 3,990 4,325 2,949 1,832 312 13,674
2019 1,133 14,810 15,023 9,755 6,024 1,631 48,376 274 4,099 4,422 3,218 1,921 342 14,276
2020 999 16,099 16,115 10,812 6,079 1,710 51,814 247 4,307 4,432 3,555 1,929 372 14,842
2021 944 17,114 16,731 11,779 6,000 1,731 54,299 245 4,571 4,639 3,740 1,876 364 15,435
2022 1,061 17,220 16,770 12,187 6,086 1,881 55,205 242 4,564 4,509 3,880 1,886 408 15,489
2023 1,293 16,527 16,822 12,330 6,042 1,864 54,878 332 4,442 4,478 3,996 1,921 431 15,600
.