Year	Number
1960	3100
1961	3173
1962	3232
1963	3341
1964	3478
1965	3696
1966	3922
1967	4095
1968	4286
1969	4487
1970	4696
1971	4903
1972	5119
1973	5366
1974	5638
1975	5926
1976	6219
1977	6503
1978	6770
1979	7022
1980	7275
1981	7531
1982	7785
1983	8029
1984	8261
1985	8478
1986	8672
1987	8821
1988	8945
1989	9094
1990	9287
1991	9544
1992	9901
1993	10327
1994	10744
1995	11145
1996	11553
1997	11966
1998	12360
1999	12715
2000	13068
2001	13442
2002	13808
2003	14155
2004	14486
2005	14811
2006	15167
2007	15580
2008	16055
2009	16721
2010	17642
2011	18877
2012	20477
2013	22298
2014	24247
2015	26220
2016	28238
2017	30475
2018	32979
2019	35708
2020	38506
2021	41251
2022	43926
2023	46562