| 1996 | 20,265 | 20,369 | 19,581 | 21,421 |
| 1997 | 21,401 | 21,756 | 21,178 | 23,335 |
| 1998 | 23,040 | 23,266 | 22,010 | 23,018 |
| 1999 | 22,457 | 22,515 | 21,857 | 24,257 |
| 2000 | 23,759 | 23,830 | 22,949 | 25,075 |
| 2001 | 24,563 | 24,834 | 23,583 | 25,649 |
| 2002 | 24,856 | 25,476 | 24,580 | 26,875 |
| 2003 | 26,182 | 26,787 | 25,709 | 27,918 |
| 2004 | 27,417 | 28,299 | 27,622 | 30,373 |
| 2005 | 29,114 | 29,981 | 29,203 | 32,051 |
| 2006 | 30,847 | 31,880 | 30,845 | 34,057 |
| 2007 | 32,552 | 33,625 | 32,346 | 35,701 |
| 2008 | 34,538 | 35,308 | 33,496 | 35,969 |
| 2009 | 33,758 | 34,311 | 33,255 | 36,429 |
| 2010 | 34,410 | 36,512 | 35,749 | 39,143 |
| 2011 | 37,427 | 38,796 | 37,359 | 41,308 |
| 2012 | 39,680 | 41,317 | 39,836 | 43,591 |
| 2013 | 41,322 | 42,736 | 41,003 | 44,804 |
| 2014 | 42,332 | 43,460 | 41,541 | 45,576 |
| 2015 | 43,393 | 44,344 | 42,487 | 46,407 |
| 2016 | 44,672 | 44,901 | 43,332 | 46,821 |
| 2017 | 44,512 | 45,205 | 44,141 | 48,309 |
| 2018 | 46,465 | 47,664 | 45,240 | 50,065 |
| 2019 | 47,107 | 48,324 | 46,662 | 48,749 |
| 2020 | 47,148 | 41,155 | 42,145 | 48,666 |
| 2021 | 47,096 | 48,844 | 49,358 | 54,840 |
| 2022 | 50,613 | 51,361 | 49,460 | 53,589 |
| 2023 | 50,270 | 50,959 | 49,753 | |
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