Year	Number
1965	421479
1966	421918
1967	422124
1968	421509
1969	420668
1970	419501
1971	418929
1972	417805
1973	416117
1974	416109
1975	417197
1976	416672
1977	416581
1978	418684
1979	421181
1980	423084
1981	426730
1982	432286
1983	440688
1984	447297
1985	452920
1986	460600
1987	468603
1988	478092
1989	490680
1990	502399
1991	512575
1992	523296
1993	534684
1994	546143
1995	555253
1996	560831
1997	561839
1998	560352
1999	562238
2000	566363
2001	567749
2002	567362
2003	565099
2004	560962
2005	557244
2006	554999
2007	553138
2008	553816
2009	555541
2010	557182
2011	559617
2012	561691
2013	562047
2014	563621
2015	564969
2016	565847
2017	565509
2018	563274
2019	558717
2020	553991
2021	547735
2022	539461