Year	Number
1960	313970
1961	316845
1962	320750
1963	324100
1964	327750
1965	331500
1966	333895
1967	334995
1968	335850
1969	337500
1970	339171
1971	342421
1972	346600
1973	350450
1974	355050
1975	358950
1976	360731
1977	361358
1978	362007
1979	362856
1980	364150
1981	365225
1982	365525
1983	365622
1984	365998
1985	366706
1986	368355
1987	370750
1988	373450
1989	377100
1990	381850
1991	387000
1992	392175
1993	397475
1994	402925
1995	408625
1996	414225
1997	419450
1998	424700
1999	430475
2000	436300
2001	441525
2002	446175
2003	451630
2004	458095
2005	465158
2006	472637
2007	479993
2008	488650
2009	497783
2010	506953
2011	518347
2012	530946
2013	543360
2014	556319
2015	569604
2016	582014
2017	596336
2018	607950
2019	620001
2020	630419
2021	640064
2022	653103
2023	668606