Year	Total
1970	9415000
1971	15646000
1972	22576000
1973	24512000
1974	29562000
1975	30783000
1976	32599000
1977	34061000
1978	32617000
1979	32936000
1980	31311000
1981	31241000
1982	31753000
1983	32741000
1984	32007000
1985	35711000
1986	37545000
1987	39307000
1988	37853000
1989	37069000
1990	40932000
1991	45574000
1992	46345000
1993	54488000
1994	58172000
1995	63679000
1996	75732000
1997	77272000
1998	81145000
1999	89177000
2000	97537000
2001	95243000
2002	93245000
2003	92642000
2004	86723000
2005	79353000
2006	71965000
2007	64868000
2008	62667000
2009	53713000
2010	51421000
2011	40715000
2012	34992000
2013	32829000
2014	33110000
2015	35625000
2016	36900000