Year	Number
1960	19084
1961	19632
1962	20292
1963	20996
1964	21616
1965	22042
1966	22225
1967	22176
1968	21990
1969	21831
1970	21814
1971	22059
1972	22590
1973	23305
1974	24108
1975	24921
1976	25724
1977	26531
1978	27291
1979	27975
1980	28593
1981	29128
1982	29527
1983	29809
1984	30079
1985	30348
1986	30538
1987	30649
1988	30760
1989	30884
1990	31106
1991	31640
1992	32475
1993	33588
1994	34679
1995	35697
1996	36646
1997	37423
1998	38202
1999	38904
2000	39614
2001	40716
2002	41937
2003	43206
2004	44449
2005	45593
2006	46369
2007	46850
2008	47282
2009	47608
2010	47704
2011	47966
2012	48587
2013	49419
2014	50611
2015	52026
2016	53262
2017	54461
2018	55783
2019	57202
2020	58486
2021	59381
2022	60285
2023	61445