Year	Number
1960	9312
1961	9388
1962	9288
1963	9072
1964	8762
1965	8412
1966	8129
1967	7936
1968	7768
1969	7625
1970	7511
1971	7429
1972	7349
1973	7302
1974	7375
1975	7599
1976	7998
1977	8602
1978	9439
1979	10543
1980	11942
1981	13199
1982	14226
1983	15386
1984	16664
1985	18044
1986	19499
1987	20988
1988	22453
1989	24079
1990	26644
1991	29737
1992	32583
1993	35434
1994	38355
1995	41352
1996	44434
1997	47614
1998	50874
1999	54233
2000	57698
2001	61164
2002	64598
2003	68035
2004	71462
2005	74863
2006	78228
2007	81567
2008	84961
2009	88443
2010	91972
2011	95652
2012	99437
2013	103319
2014	107730
2015	112698
2016	117903
2017	123313
2018	128996
2019	135027
2020	141649
2021	148683
2022	156544
2023	165668