Year	Number
1960	351959
1961	356677
1962	363434
1963	371067
1964	379618
1965	388217
1966	396029
1967	402140
1968	407694
1969	413785
1970	419615
1971	425032
1972	430001
1973	435058
1974	440453
1975	445759
1976	450256
1977	454311
1978	457996
1979	460776
1980	463684
1981	467419
1982	471541
1983	475383
1984	479751
1985	485066
1986	490284
1987	495068
1988	498544
1989	500495
1990	501113
1991	498710
1992	487875
1993	473479
1994	462791
1995	454097
1996	447579
1997	443525
1998	441480
1999	448264
2000	455232
2001	453931
2002	452541
2003	451377
2004	450242
2005	448772
2006	446092
2007	443333
2008	441915
2009	440752
2010	438949
2011	436127
2012	432444
2013	428725
2014	425349
2015	423826
2016	422355
2017	421626
2018	422780
2019	424046
2020	424011
2021	423870
2022	429181
2023	433912