Year	Number
1963	94130
1964	83249
1965	73967
1966	66993
1967	61730
1968	57877
1969	55612
1970	54725
1971	54978
1972	55705
1973	56315
1974	57218
1975	58291
1976	59207
1977	60064
1978	60711
1979	61018
1980	60915
1981	60810
1982	61208
1983	62015
1984	62007
1985	60551
1986	58911
1987	57459
1988	54602
1989	50422
1990	46372
1991	42618
1992	38945
1993	35587
1994	33481
1995	32043
1996	30402
1997	28769
1998	27420
1999	26046
2000	24926
2001	24309
2002	23766
2003	23109
2004	22127
2005	20740
2006	19438
2007	18793
2008	18579
2009	18470
2010	18423
2011	18415
2012	18455
2013	18139
2014	17259
2015	15993
2016	14461
2017	12520
2018	10726
2019	9329
2020	8181
2021	7346
2022	6705