Year	Number
1996	25503
1997	25860
1998	24716
1999	22983
2000	23344
2001	21161
2002	20789
2003	19439
2004	18762
2005	17873
2006	17378
2007	16790
2008	16346
2009	15075
2010	14885
2011	14608
2012	14489
2013	14388
2014	14596
2016	14876
2017	17393
2018	19225
2019	20668
2020	22340
2021	22885