Year	Number
1990	43408
1991	36236
1992	34888
1993	33515
1994	32242
1995	30933
1996	29687
1997	28490
1998	27304
1999	26114
2000	24894
2001	23662
2002	22486
2003	23906
2004	20651
2005	20141
2006	19900
2007	19755
2008	19702
2009	19765
2010	19779
2011	20787
2012	24392
2013	25246
2014	24703
2015	24777
2016	22823
2017	23103
2018	23760
2019	21117
2020	19632
2021	19727
2022	18552