Year	Number
1960	296285
1961	303183
1962	310252
1963	317485
1964	324897
1965	332461
1966	340212
1967	348144
1968	356272
1969	364567
1970	372344
1971	379413
1972	386627
1973	393958
1974	401438
1975	409060
1976	416837
1977	424741
1978	432805
1979	439555
1980	444615
1981	449720
1982	454890
1983	460120
1984	465418
1985	470761
1986	476173
1987	481648
1988	487193
1989	485756
1990	476411
1991	467247
1992	458246
1993	449443
1994	440797
1995	432318
1996	423990
1997	417567
1998	411233
1999	404995
2000	400224
2001	399611
2002	398998
2003	398386
2004	397774
2005	397165
2006	396556
2007	395948
2008	395340
2009	394734
2010	394129
2011	393525
2012	396431
2013	402920
2014	409523
2015	416235
2016	423066
2017	429990
2018	437027
2019	441321
2020	445259
2021	448770
2022	451776
2023	454245