Year	Number
1960	12648
1961	12917
1962	13205
1963	13517
1964	13856
1965	14211
1966	14407
1967	14436
1968	14468
1969	14676
1970	15050
1971	15418
1972	15793
1973	16188
1974	16431
1975	16506
1976	16559
1977	16588
1978	16615
1979	16853
1980	17303
1981	17766
1982	18223
1983	18659
1984	19073
1985	19478
1986	19905
1987	20348
1988	20778
1989	21203
1990	21635
1991	21979
1992	22225
1993	22470
1994	22766
1995	23116
1996	23550
1997	24080
1998	24650
1999	25250
2000	25888
2001	26547
2002	27249
2003	27998
2004	28750
2005	29479
2006	30252
2007	31090
2008	31929
2009	32785
2010	33665
2011	34466
2012	35155
2013	35809
2014	36416
2015	36985
2016	37520
2017	38011
2018	38478
2019	38973
2020	39577
2021	40289
2022	41016
2023	41747