Year	Number
1960	13967
1961	14454
1962	14963
1963	15483
1964	16009
1965	16550
1966	17104
1967	17670
1968	18257
1969	18869
1970	19503
1971	20160
1972	20842
1973	21541
1974	22259
1975	22990
1976	23728
1977	24468
1978	25038
1979	25089
1980	25169
1981	25649
1982	26166
1983	26723
1984	27331
1985	27987
1986	28692
1987	29438
1988	30222
1989	31041
1990	31922
1991	32882
1992	33897
1993	34923
1994	35859
1995	36708
1996	37513
1997	38274
1998	38997
1999	39684
2000	40277
2001	40818
2002	41366
2003	41873
2004	42352
2005	42812
2006	43274
2007	43773
2008	44346
2009	44978
2010	45883
2011	47109
2012	48448
2013	49869
2014	51361
2015	52879
2016	54380
2017	55857
2018	57294
2019	58674
2020	59987
2021	61215
2022	62325
2023	63296