Year	Number
1990	23450
1991	23284
1992	23126
1993	22629
1994	22419
1995	22225
1996	22161
1997	22086
1998	22049
1999	21983
2000	21897
2001	21867
2002	21827
2003	22076
2004	22933
2005	30115
2006	26063
2007	28135
2008	29706
2009	30603
2010	30896
2011	30814
2012	30472
2013	30033
2014	29669
2015	29247
2016	28836
2017	28416
2018	28214
2019	27846
2020	27448
2021	27009
2022	26715