Year	Number
1960	33800
1961	33992
1962	34599
1963	35253
1964	35850
1965	36385
1966	36725
1967	37080
1968	37644
1969	38286
1970	38961
1971	39858
1972	40246
1973	40466
1974	41394
1975	42170
1976	42823
1977	43418
1978	43651
1979	44029
1980	44558
1981	45140
1982	45926
1983	46511
1984	46912
1985	47208
1986	47165
1987	46701
1988	45894
1989	45024
1990	44375
1991	43878
1992	43529
1993	43464
1994	43399
1995	43391
1996	43589
1997	43639
1998	42763
1999	41134
2000	39388
2001	37984
2002	38173
2003	39151
2004	40006
2005	41191
2006	42332
2007	43145
2008	43601
2009	43769
2010	44182
2011	44676
2012	45142
2013	45925
2014	46766
2015	47582
2016	48300
2017	48718
2018	51986
2019	53279
2020	51544
2021	50874
2022	50162
2023	49467