Year	Number
1970	56082
1971	57135
1972	57135
1973	57135
1974	57135
1975	91740
1976	96499
1981	118738
1982	135053
1983	144689
1984	160511
1985	174766
1986	195558
1987	210602
1988	232168
1989	257787
1990	294648
1991	318189
1992	350092
1993	383969
1994	404878
1995	431663
1996	462259
1997	507616
1998	539945
1999	572596
2000	605712
2001	636616
2002	647219
2003	658083
2004	666821
2005	657625
2006	664999
2007	678359
2008	688898
2009	690883
2010	691030
2011	695766
2012	697773
2013	701163
2014	668540
2015	687139
2016	649964
2017	622083
2018	447801
2019	562193
2020	567343
2021	573277