Year	Number
1960	29398
1961	32087
1962	34868
1963	36357
1964	36615
1965	37143
1966	37896
1967	38731
1968	39566
1969	40055
1970	40253
1971	40585
1972	41083
1973	41709
1974	42441
1975	43257
1976	44083
1977	44830
1978	45499
1979	46193
1980	46832
1981	47307
1982	47609
1983	47788
1984	48043
1985	48383
1986	48670
1987	48828
1988	48835
1989	48714
1990	48517
1991	48266
1992	47917
1993	47535
1994	47314
1995	47377
1996	47614
1997	47875
1998	48138
1999	48357
2000	48734
2001	49353
2002	50088
2003	50992
2004	52193
2005	53730
2006	55317
2007	56688
2008	57795
2009	58698
2010	59513
2011	60514
2012	61784
2013	63341
2014	65180
2015	67548
2016	70103
2017	72820
2018	76278
2019	80476
2020	85216
2021	90284
2022	96007
2023	102699