Year	Total
1965	15122000
1966	18002000
1967	19729000
1968	21490000
1969	22058000
1970	24412000
1971	25692000
1972	26130000
1973	27863000
1974	29517000
1975	29136000
1976	29779000
1977	31192000
1978	31249000
1979	31772000
1980	30442000
1981	29426000
1982	29307000
1983	29025000
1984	30450000
1985	28928000
1986	29632000
1987	30248000
1988	31648000
1989	32742000
1990	33193000
1991	32259000
1992	32362000
1993	34065000
1994	35349000
1995	36454000
1996	37011000
1997	37677000
1998	37600000
1999	38806000
2000	38585000
2001	38834000
2002	38651000
2003	38582000
2004	39711000
2005	39489000
2006	42861000
2007	42508000
2008	43201000
2009	43525000
2010	43725000
2011	46326000
2012	47897000
2013	48152000
2014	48124000
2015	47863000
2016	47833000