Year	Number
1960	4494
1961	4567
1962	4652
1963	4744
1964	4833
1965	4930
1966	5030
1967	5130
1968	5232
1969	5327
1970	5497
1971	5781
1972	6106
1973	6438
1974	6773
1975	7109
1976	7441
1977	7768
1978	8075
1979	8377
1980	8734
1981	9137
1982	9556
1983	9983
1984	10416
1985	10855
1986	11296
1987	11739
1988	12184
1989	12662
1990	13246
1991	13919
1992	14601
1993	15293
1994	15995
1995	16702
1996	17414
1997	18121
1998	18820
1999	19509
2000	20191
2001	20878
2002	21567
2003	22258
2004	22964
2005	23681
2006	24400
2007	25123
2008	25849
2009	26569
2010	27277
2011	27924
2012	28512
2013	29100
2014	29706
2015	30339
2016	30984
2017	31627
2018	32258
2019	32849
2020	33370
2021	33738
2022	34036
2023	34367