Year	Number
1960	11061
1961	11219
1962	11414
1963	11642
1964	11889
1965	12146
1966	12416
1967	12699
1968	12991
1969	13274
1970	13545
1971	13805
1972	14054
1973	14296
1974	14539
1975	14786
1976	15037
1977	15291
1978	15538
1979	15776
1980	15985
1981	16157
1982	16317
1983	16485
1984	16669
1985	16867
1986	17076
1987	17296
1988	17529
1989	17842
1990	18225
1991	18612
1992	19011
1993	19420
1994	19813
1995	20176
1996	20525
1997	20870
1998	21214
1999	21574
2000	21965
2001	22373
2002	22785
2003	23224
2004	23719
2005	24269
2006	24872
2007	25530
2008	26248
2009	27023
2010	27852
2011	28721
2012	29619
2013	30508
2014	31396
2015	32339
2016	33327
2017	34341
2018	35386
2019	36472
2020	37411
2021	37616
2022	37129
2023	36941