Year	Number
1990	24379
1991	24374
1992	24327
1993	24019
1994	23666
1995	23401
1996	23299
1997	23286
1998	23343
1999	23363
2000	23234
2001	22901
2002	22468
2003	21954
2004	21349
2005	20635
2006	19797
2007	18901
2008	17948
2009	16944
2010	15945
2011	14962
2012	14049
2013	13148
2014	12265
2015	11439
2016	10684
2017	10038
2018	9547
2019	9153
2020	8853
2021	8579
2022	8337