Year	Number
1960	73334
1961	75308
1962	79394
1963	83272
1964	87020
1965	90546
1966	93540
1967	95674
1968	96751
1969	96636
1970	95085
1971	90564
1972	84267
1973	78770
1974	74007
1975	69924
1976	66482
1977	63615
1978	61224
1979	59317
1980	58109
1981	58361
1982	60106
1983	62541
1984	65441
1985	68686
1986	72218
1987	76127
1988	80313
1989	84739
1990	89410
1991	94002
1992	97879
1993	100824
1994	103013
1995	104566
1996	105435
1997	105324
1998	104255
1999	102447
2000	99785
2001	96499
2002	93370
2003	90252
2004	86696
2005	83196
2006	80112
2007	77270
2008	74837
2009	73183
2010	72145
2011	72009
2012	73293
2013	75205
2014	77081
2015	79169
2016	81658
2017	84732
2018	88489
2019	92702
2020	96945
2021	100338
2022	103011
2023	105600