Year	Number
1971	191287
1972	163982
1973	190576
1974	196411
1975	203143
1976	198849
1977	225727
1978	237999
1979	252100
1980	262833
1981	257547
1982	249905
1983	247702
1984	246129
1985	287804
1986	276438
1987	270140
1988	288914
1989	302809
1990	310064
1991	346807
1992	359406
1993	421869
1994	471792
1995	544729
1996	584161
1997	649835
1998	674732
1999	726561
2000	790497
2001	853623
2002	997645
2003	1073458
2004	1147388
2005	1206743
2006	1258038
2007	1317791
2008	1364491
2009	1389685
2010	1453355
2011	1536722
2012	1599839
2013	1666156
2014	1729630
2015	1649043
2016	1776560
2017	1929881
2018	1998858
2019	1989274
2020	2107661
2021	2072250