Year	Total
1970	24004000
1971	33176000
1972	44234000
1973	53788000
1974	63772000
1975	69074000
1976	73803000
1977	74042000
1978	67784000
1979	71081000
1980	68740000
1981	63820000
1982	54576000
1983	58111000
1984	58828000
1985	61598000
1986	56320000
1987	56415000
1988	49799000
1989	54433000
1990	54935000
1991	62052000
1992	62482000
1993	63724000
1994	60189000
1995	60858000
1996	68883000
1997	61001000
1998	58183000
1999	54122000
2000	52188000
2001	56033000
2002	54218000
2003	52212000
2004	61574000
2005	56248000
2006	55388000
2007	54433000
2008	59879000
2009	56415000
2010	63437000
2011	57729000
2012	57419000
2013	61766000
2014	52116000
2015	39004000
2016	36137000