Year	Number
1970	457900
1971	494100
1972	545800
1973	592800
1974	611200
1975	590200
1976	601500
1977	645000
1978	688000
1979	694000
1980	541500
1981	522100
1982	574300
1983	601400
1984	710100
1985	778000
1986	808400
1987	910100
1988	844700
1989	735900
1990	759500
1991	772600
1992	767100
1993	801000
1994	1031200
1995	1097000
1996	1239100
1997	1334400
1998	1592700
1999	1350200
2000	1431818
2001	1357946
2002	1198920
2003	1133775
2004	1332811
2005	1528929
2006	1536157
2007	1720496
2008	1423422
2009	1364651
2010	1851416.84175507
2011	2150527
2012	2400160
2013	2602714
2014	3035882.7791066
2015	4134980
2016	5710834
2017	7242611
2018	7819740.55998243
2019	4656017
2020	903927
2021	1499034