| Year | N |
| 2004 | 375 |
| 2005 | 421 |
| 2006 | 401 |
| 2007 | 404 |
| 2008 | 411 |
| 2009 | 406 |
| 2010 | 450 |
| 2011 | 505 |
| 2012 | 462 |
| 2013 | 571 |
| 2014 | 613 |
| 2015 | 720 |
| 2016 | 758 |
| 2017 | 805 |
| 2018 | 797 |
| Total | 8099 |