Year	Number
1960	10936
1961	11546
1962	12492
1963	13488
1964	14542
1965	15661
1966	16870
1967	18188
1968	19629
1969	21191
1970	22901
1971	23930
1972	24704
1973	25498
1974	26332
1975	27221
1976	28188
1977	29230
1978	30335
1979	31459
1980	32548
1981	33576
1982	35150
1983	36838
1984	38625
1985	40563
1986	42659
1987	44934
1988	47388
1989	49927
1990	52527
1991	55133
1992	57502
1993	59883
1994	62292
1995	64717
1996	67154
1997	69585
1998	72004
1999	74402
2000	76778
2001	79531
2002	83244
2003	87285
2004	91420
2005	95658
2006	100012
2007	104489
2008	109066
2009	113687
2010	118302
2011	122908
2012	127553
2013	132158
2014	136694
2015	141137
2016	145477
2017	149719
2018	153865
2019	157941
2020	162568
2021	167493
2022	172252
2023	177140