Year	Number
1960	33396
1961	34287
1962	35102
1963	35928
1964	36835
1965	37808
1966	38786
1967	39793
1968	40835
1969	41914
1970	42698
1971	42814
1972	42713
1973	42509
1974	42296
1975	42124
1976	42043
1977	42075
1978	42163
1979	42294
1980	42426
1981	42496
1982	42544
1983	42607
1984	42525
1985	42268
1986	41997
1987	41712
1988	41419
1989	41144
1990	40893
1991	41066
1992	41973
1993	42984
1994	44043
1995	45169
1996	46353
1997	47559
1998	48728
1999	49837
2000	50942
2001	52024
2002	53189
2003	54290
2004	55387
2005	56533
2006	57754
2007	59050
2008	60436
2009	61864
2010	63210
2011	64437
2012	65294
2013	66063
2014	66771
2015	67456
2016	68062
2017	68601
2018	69087
2019	69543
2020	70023
2021	70492
2022	70935
2023	71353