Year	Number
1960	44238
1961	44850
1962	45462
1963	46042
1964	46599
1965	47169
1966	47755
1967	48317
1968	48854
1969	49389
1970	49907
1971	50380
1972	50802
1973	51196
1974	51565
1975	51880
1976	52144
1977	52388
1978	52602
1979	52755
1980	52880
1981	53168
1982	53594
1983	53987
1984	54346
1985	54663
1986	54929
1987	55144
1988	55325
1989	55479
1990	55609
1991	55723
1992	55862
1993	56017
1994	56127
1995	56192
1996	56203
1997	56148
1998	56045
1999	55925
2000	55810
2001	55700
2002	55587
2003	55395
2004	55114
2005	54797
2006	54464
2007	54143
2008	53871
2009	53620
2010	53341
2011	53026
2012	52710
2013	52397
2014	52139
2015	51944
2016	51704
2017	51523
2018	51425
2019	51288
2020	51199
2021	51123
2022	51020
2023	50986