Year	Number
1960	14145
1961	14453
1962	14266
1963	15680
1964	15524
1965	15974
1966	16361
1967	16756
1968	18303
1969	19068
1970	19302
1971	20729
1972	21414
1973	22654
1974	23230
1975	23390
1976	22803
1977	21159
1978	20838
1979	19979
1980	19781
1981	18938
1982	18121
1983	17343
1984	16585
1985	15839
1986	15109
1987	14403
1988	13722
1989	13076
1990	12803
1991	12278
1992	11776
1993	11288
1994	10803
1995	10311
1996	9818
1997	9347
1998	8888
1999	8440
2000	8055
2001	7800
2002	7557
2003	7323
2004	7093
2005	6872
2006	6653
2007	6443
2008	6245
2009	6050
2010	5858
2011	5673
2012	5497
2013	5326
2014	5164
2015	5009
2016	4860
2017	4717
2018	4579
2019	4446
2020	4316
2021	4192
2022	4073
2023	3959