Year	Total
1965	15940000
1966	16257000
1967	17941000
1968	20854000
1969	24053000
1970	26211000
1971	26855000
1972	29075000
1973	30561000
1974	26875000
1975	25404000
1976	26486000
1977	26055000
1978	27798000
1979	27638000
1980	25567000
1981	23429000
1982	22177000
1983	20077000
1984	19393000
1985	19664000
1986	22265000
1987	22430000
1988	23125000
1989	22699000
1990	23854000
1991	25695000
1992	26271000
1993	25862000
1994	27999000
1995	27700000
1996	30178000
1997	30970000
1998	31299000
1999	30109000
2000	30930000
2001	30966000
2002	31737000
2003	33673000
2004	33697000
2005	33624000
2006	33812000
2007	34564000
2008	35950000
2009	31545000
2010	32707000
2011	30524000
2012	29632000
2013	30145000
2014	29711000
2015	30958000
2016	31769000