Year	Number
1960	34154
1961	34572
1962	34963
1963	35385
1964	35841
1965	36346
1966	36825
1967	37234
1968	37630
1969	38011
1970	38416
1971	38861
1972	39304
1973	39746
1974	40189
1975	40626
1976	41054
1977	41481
1978	41965
1979	42506
1980	43054
1981	43613
1982	44164
1983	44669
1984	45135
1985	45575
1986	46011
1987	46477
1988	46959
1989	47490
1990	47479
1991	46810
1992	46005
1993	45096
1994	44131
1995	43805
1996	44138
1997	44495
1998	44865
1999	45203
2000	45660
2001	46245
2002	46813
2003	47392
2004	47989
2005	48291
2006	48313
2007	48361
2008	48411
2009	48429
2010	48410
2011	48386
2012	48392
2013	48418
2014	48465
2015	48816
2016	49500
2017	50230
2018	50955
2019	51681
2020	52415
2021	52889
2022	53090
2023	53270