Year	Number
1960	47343
1961	47585
1962	48015
1963	48526
1964	49198
1965	50036
1966	51070
1967	52174
1968	53415
1969	54703
1970	56195
1971	57985
1972	59859
1973	61744
1974	63915
1975	66824
1976	70030
1977	73169
1978	76196
1979	79109
1980	81665
1981	82854
1982	83022
1983	82856
1984	83184
1985	84445
1986	86294
1987	88411
1988	90429
1989	92019
1990	93278
1991	94162
1992	95117
1993	96392
1994	97729
1995	99510
1996	100396
1997	100706
1998	100764
1999	100207
2000	99136
2001	97180
2002	94413
2003	90885
2004	87105
2005	83245
2006	79451
2007	75907
2008	72515
2009	70401
2010	68028
2011	65649
2012	62792
2013	60939
2014	59024
2015	57234
2016	55447
2017	54118
2018	53201
2019	52705
2020	52158
2021	51641
2022	51010