Year	Number
1970	175420
1971	171454
1972	176404
1973	187459
1974	218038
1975	221922
1976	222004
1977	226019
1978	228523
1979	235604
1980	244838
1981	259046
1982	277945
1983	289590
1984	297484
1985	314003
1986	319128
1987	331857
1988	345524
1989	348818
1990	351632
1991	361144
1992	362657
1993	354275
1994	366935
1995	378011
1996	374628
1997	368895
1998	369535
1999	364951
2000	410745
2001	415007
2002	418668
2003	429720
2004	427009
2005	422278
2006	424855
2007	400943
2008	396041
2009	389424
2010	388681
2011	385437
2012	381690
2013	369469
2014	366048
2015	361637
2016	360756
2017	367931
2022	315722
2023	315198