Year	Number
1960	87373
1961	88383
1962	89625
1963	90580
1964	91354
1965	91789
1966	91775
1967	91450
1968	90813
1969	89864
1970	88630
1971	87162
1972	85518
1973	83737
1974	81835
1975	79820
1976	77750
1977	75758
1978	73984
1979	72458
1980	71093
1981	69880
1982	68891
1983	68121
1984	67503
1985	66924
1986	66255
1987	65433
1988	64474
1989	63489
1990	62554
1991	61739
1992	61129
1993	60665
1994	60268
1995	59919
1996	59585
1997	59174
1998	58687
1999	58301
2000	57913
2001	57478
2002	57176
2003	56940
2004	56611
2005	56125
2006	55570
2007	55159
2008	55125
2009	55271
2010	55184
2011	54845
2012	54372
2013	53788
2014	53096
2015	52289
2016	51441
2017	50655
2018	49959
2019	49326
2020	48765
2021	48260
2022	47667
2023	46876