Year	Number
1960	38645
1961	38941
1962	39373
1963	39901
1964	40461
1965	41023
1966	41593
1967	42178
1968	42788
1969	43457
1970	44184
1971	44944
1972	45748
1973	46608
1974	47529
1975	48487
1976	49142
1977	49389
1978	49448
1979	49286
1980	48880
1981	48230
1982	47329
1983	46225
1984	44986
1985	43652
1986	42236
1987	40740
1988	39365
1989	38502
1990	38041
1991	37694
1992	37493
1993	37436
1994	37471
1995	37430
1996	37419
1997	37567
1998	37777
1999	38055
2000	38373
2001	38488
2002	38696
2003	39132
2004	39560
2005	40122
2006	40694
2007	41376
2008	42324
2009	43471
2010	44729
2011	45876
2012	46879
2013	47933
2014	49154
2015	51192
2016	54103
2017	57247
2018	60566
2019	64109
2020	67635
2021	70602
2022	73573
2023	77123