Year	Total
1965	15476000
1966	15172000
1967	15032000
1968	16331000
1969	15767000
1970	16928000
1971	16090000
1972	15183000
1973	15637000
1974	15888000
1975	15457000
1976	18300000
1977	23384000
1978	19228000
1979	18207000
1980	22175000
1981	22641000
1982	23925000
1983	25031000
1984	27882000
1985	26801000
1986	24839000
1987	26697000
1988	28669000
1989	28609000
1990	27137000
1991	26268000
1992	26759000
1993	23758000
1994	25191000
1995	26331000
1996	26881000
1997	28104000
1998	30055000
1999	28901000
2000	30588000
2001	31796000
2002	31992000
2003	31926000
2004	29997000
2005	30051000
2006	29164000
2007	30286000
2008	29399000
2009	23485000
2010	24766000
2011	21762000
2012	21050000
2013	20765000
2014	19731000
2015	19646000
2016	18677000