Year	Number
1970	8147600
1971	8263700
1972	8254700
1973	8409000
1974	7796100
1975	7633500
1976	7824900
1977	8158300
1978	8367500
1979	8666100
1980	8640600
1981	8176300
1982	8193100
1983	8508000
1984	8971400
1985	9443800
1986	10152300
1987	10633200
1988	11155300
1989	11302500
1990	11832500
1991	11517500
1992	11936900
1993	12024600
1994	13152600
1995	13849900
1996	14663400
1997	15188600
1998	15371000
1999	16409600
2000	17624505
2001	17392600
2002	16063702
2003	16602403
2004	18407015
2005	18709113
2006	18809257
2007	19348839
2008	18688257
2009	18650104
2010	20927396.79163628
2011	21094558.129246823
2012	20984277.381897546
2013	21039809.2984916
2014	21081416.36764928
2015	21455548
2016	22020267
2017	22182317.92
2018	22460256.787081297
2019	22822190.733
2020	11609007.87
2021	14702405.542