Year	Number
1972	4096
1980	3129
1981	3341
1982	3691
1984	4465
1987	5675
1988	6413
1989	6891
1990	7866
1994	14097
2000	44715
2001	44748
2002	48055
2003	49522
2004	49790
2005	52671
2006	61465
2007	60783
2008	61906
2009	60769
2010	61677
2011	62222
2012	61956
2013	62297
2014	59823
2015	58657
2016	57730
2017	56469
2018	53355
2019	53616
2020	55705
2021	55338