Year	Number
1960	431956
1961	434996
1962	434899
1963	434503
1964	433604
1965	431605
1966	430114
1967	428776
1968	426029
1969	422057
1970	419012
1971	417589
1972	417729
1973	418970
1974	419317
1975	421536
1976	425858
1977	429015
1978	431903
1979	435113
1980	437621
1981	436334
1982	434595
1983	434881
1984	434643
1985	433735
1986	434988
1987	435039
1988	430412
1989	423932
1990	416349
1991	407869
1992	398204
1993	387721
1994	377140
1995	366544
1996	355608
1997	345056
1998	334898
1999	326100
2000	318664
2001	311291
2002	303741
2003	296444
2004	290571
2005	286443
2006	283946
2007	283797
2008	284313
2009	287932
2010	290839
2011	293845
2012	297447
2013	300938
2014	304230
2015	306861
2016	308922
2017	310963
2018	313832
2019	317146
2020	319621
2021	320184
2022	319260
2023	317331