Year	Number
1970	53740
1972	58410
1973	57911
1974	51029
1976	51007
1977	50552
1978	58347
1979	59293
1980	60489
1981	61722
1982	59010
1983	62419
1984	64655
1985	64699
1986	66881
1987	64793
1988	64084
1989	65657
1990	67690
1991	66403
1992	66384
1993	70527
1994	69365
1995	71624
1996	72480
1998	83520
1999	87140
2000	47425
2001	43729
2002	38674
2003	34830
2004	35225
2005	33035
2006	29360
2007	31914
2008	29779
2009	30382
2010	27402
2011	25078
2012	23731
2013	22417
2014	23624
2015	23639
2016	22439
2017	19002
2022	44681
2023	48765