Year	Number
1971	17091
1972	17141
1973	18436
1974	18966
1975	19207
1999	25012
2000	24682
2001	24240
2002	24916
2003	26691
2004	27014
2005	27037
2006	28517
2007	28572
2008	27371
2009	27817
2010	27763
2011	28789
2012	29096
2013	27785
2014	27613
2016	27140
2017	26933
2018	26880
2019	27142
2020	27546
2021	28245
2022	28461