Year	Number
1960	176537
1961	174762
1962	173777
1963	173154
1964	172661
1965	171999
1966	171037
1967	169808
1968	168506
1969	167115
1970	165042
1971	162540
1972	160201
1973	157791
1974	154822
1975	150905
1976	146764
1977	142736
1978	138924
1979	134316
1980	128747
1981	123881
1982	119220
1983	114517
1984	110353
1985	106828
1986	103196
1987	98667
1988	93710
1989	89633
1990	86133
1991	82941
1992	80142
1993	77272
1994	74094
1995	70749
1996	67374
1997	63945
1998	60741
1999	58140
2000	55752
2001	53316
2002	51008
2003	48782
2004	46729
2005	44804
2006	42972
2007	41297
2008	39808
2009	38438
2010	37124
2011	35959
2012	34878
2013	33741
2014	32308
2015	30520
2016	28822
2017	27393
2018	26036
2019	24463
2020	23187
2021	21925
2022	20663