Year	Number
1975	14577
1976	14152
1977	13328
1978	13712
1979	14099
1980	17273
1981	17335
1982	16968
1983	18876
1984	19829
1985	20555
1986	22094
1987	23783
1988	23634
1989	23671
1990	23732
1991	24666
1992	24947
1993	28300
1994	30290
1995	33379
1996	35617
1997	36946
1998	37928
1999	38414
2000	39892
2001	40157
2002	38894
2003	41051
2004	38724
2005	39096
2006	43104
2007	44034
2008	43949
2009	42669
2010	43427
2011	44323
2012	43772
2013	44853
2014	45743
2015	43983
2016	43806
2017	43440
2018	45050
2019	49921
2020	49839
2021	51337
2022	47926