Year	Number
1960	45437
1961	47251
1962	49457
1963	51690
1964	53863
1965	55925
1966	57864
1967	59733
1968	61549
1969	63315
1970	64958
1971	66266
1972	67207
1973	67985
1974	68717
1975	69739
1976	70921
1977	71837
1978	72537
1979	73060
1980	73765
1981	74648
1982	75482
1983	76376
1984	77324
1985	78334
1986	79410
1987	80542
1988	81712
1989	82951
1990	84633
1991	86666
1992	88589
1993	90323
1994	91798
1995	92958
1996	93871
1997	94631
1998	95237
1999	95689
2000	95564
2001	94834
2002	93904
2003	92790
2004	91518
2005	90134
2006	88665
2007	87083
2008	85377
2009	83562
2010	82196
2011	81515
2012	80954
2013	80325
2014	79716
2015	79178
2016	78842
2017	78709
2018	78501
2019	78138
2020	77679
2021	77123
2022	76526
2023	75930