Year	Number
1971	531934
1972	534895
1973	528541
1974	520761
1975	513027
1976	501843
1977	492723
1978	466933
1979	445103
1980	420935
1981	400397
1982	384986
1983	367691
1984	354479
1985	342779
1986	343823
1987	343013
1988	350734
1989	360542
1990	367006
1991	370210
1992	378676
1993	382663
1994	381628
1995	381363
1996	382005
1997	381927
1998	385309
1999	388777
2000	392407
2001	392339
2002	386484
2003	379920
2004	372963
2005	362822
2006	355293
2007	347249
2008	337448
2009	331565
2010	328015
2011	326351
2012	326955
2013	327187
2014	327246.84375
2015	327816.84375
2016	329031.5
2017	334933.15625
2018	339021.84375
2019	342064
2020	343980.5
2021	346610.5
2022	347620.5