Year	Number
1960	3074
1961	3084
1962	3098
1963	3114
1964	3121
1965	3128
1966	3133
1967	3129
1968	3353
1969	3920
1970	4652
1971	5469
1972	6353
1973	7338
1974	8483
1975	9910
1976	11018
1977	11591
1978	12037
1979	12284
1980	12408
1981	12874
1982	13699
1983	14497
1984	15238
1985	15954
1986	16638
1987	17317
1988	18051
1989	18835
1990	19668
1991	20565
1992	21540
1993	22578
1994	23624
1995	24583
1996	25446
1997	26295
1998	27208
1999	28242
2000	29399
2001	30598
2002	31702
2003	32580
2004	33115
2005	33100
2006	30895
2007	25463
2008	18743
2009	13729
2010	14927
2011	21243
2012	28689
2013	37483
2014	47871
2015	60097
2016	74462
2017	91391
2018	111481
2019	135505
2020	153610
2021	164678
2022	172674
2023	177543