Year	Number
1960	11335
1961	11610
1962	11865
1963	12097
1964	12318
1965	12538
1966	12757
1967	12978
1968	13209
1969	13461
1970	13746
1971	14081
1972	14594
1973	15011
1974	15471
1975	16024
1976	16572
1977	17160
1978	17427
1979	17682
1980	17929
1981	18218
1982	18422
1983	18502
1984	18676
1985	18872
1986	19032
1987	19918
1988	20156
1989	20528
1990	20904
1991	21421
1992	21692
1993	22360
1994	23159
1995	23626
1996	24079
1997	24823
1998	25834
1999	26603
2000	27126
2001	27428
2002	28543
2003	28509
2004	28740
2005	29174
2006	30080
2007	30506
2008	31441
2009	31829
2010	33032
2011	32471
2012	33000
2013	33740
2014	34353
2015	35175
2016	35648
2017	36058
2018	36387
2019	36707
2020	36990
2021	37211
2022	44753
2023	44454