Year	Number
1972	893
1973	958
1974	1004
1975	1025
1976	970
1977	1222
1978	1382
1979	1467
1980	1589
1982	1896
1983	1954
1984	2167
1985	2697
1986	2496
1987	3197
1988	3513
1989	3905
1990	3837
1991	4229
1998	5554
1999	6075
2004	11663
2005	12806
2006	11406
2007	11936
2008	17882
2011	18422
2012	35497
2013	32443
2014	32764
2015	36800
2016	39883
2021	43629
2022	46913