Year	Number
2004	10179
2005	10578
2006	11867
2007	13021
2008	13138
2010	10697
2011	11231
2012	9651
2013	10301
2014	9508
2015	9247
2016	9735
2017	9287
2018	9333
2019	8921
2020	8896
2021	9935