Year	Number
1960	14816
1961	15073
1962	15342
1963	15585
1964	15941
1965	16304
1966	16635
1967	16915
1968	17146
1969	17453
1970	17756
1971	18010
1972	18285
1973	18586
1974	18923
1975	19275
1976	19410
1977	19404
1978	19433
1979	19526
1980	19583
1981	19443
1982	19221
1983	18926
1984	18702
1985	18654
1986	18689
1987	18673
1988	18637
1989	18686
1990	18861
1991	19259
1992	19803
1993	20422
1994	21109
1995	21821
1996	22503
1997	23102
1998	23608
1999	24068
2000	24351
2001	24703
2002	25279
2003	25752
2004	26293
2005	26951
2006	27558
2007	28107
2008	28739
2009	29517
2010	30188
2011	30973
2012	32031
2013	33250
2014	34594
2015	35856
2016	36986
2017	38255
2018	39344
2019	40521
2020	41627
2021	42910
2022	44848
2023	47188