Year	Total
1965	22050000
1966	22757000
1967	23301000
1968	23796000
1969	24700000
1970	22120000
1971	23610000
1972	23633000
1973	23686000
1974	23856000
1975	22429000
1976	23316000
1977	24539000
1978	24527000
1979	25950000
1980	24259000
1981	22425000
1982	21518000
1983	21973000
1984	20701000
1985	18729000
1986	21552000
1987	23007000
1988	23010000
1989	20867000
1990	19699000
1991	20211000
1992	21339000
1993	21143000
1994	20343000
1995	20309000
1996	21110000
1997	21099000
1998	21598000
1999	20093000
2000	20328000
2001	19550000
2002	18060000
2003	18600000
2004	19505000
2005	20763000
2006	21766000
2007	24175000
2008	24877000
2009	24327000
2010	28069000
2011	28266000
2012	29600000
2013	31855000
2014	31325000
2015	32182000
2016	31905000