Year	Number
1960	42387
1961	43439
1962	44439
1963	45419
1964	46374
1965	47307
1966	48203
1967	49048
1968	49822
1969	50532
1970	51023
1971	51297
1972	51533
1973	51731
1974	51906
1975	52186
1976	52589
1977	53019
1978	53466
1979	53922
1980	54387
1981	54800
1982	55153
1983	55521
1984	55919
1985	56308
1986	56631
1987	56879
1988	57063
1989	57166
1990	57138
1991	57007
1992	56641
1993	56005
1994	55306
1995	54583
1996	53833
1997	53043
1998	52232
1999	51499
2000	50721
2001	49756
2002	48759
2003	47813
2004	46888
2005	45953
2006	44981
2007	43995
2008	43046
2009	42169
2010	41142
2011	39967
2012	38905
2013	37970
2014	37106
2015	36264
2016	35486
2017	34832
2018	34276
2019	33763
2020	33290
2021	32865
2022	32444
2023	31988