Year	Total
1965	6936000
1966	7449000
1967	6060000
1968	6342000
1969	4680000
1970	6075000
1971	6264000
1972	7150000
1973	6722000
1974	7420000
1975	8218000
1976	9712000
1977	10366000
1978	10728000
1979	11763000
1980	13165000
1981	15151000
1982	17237000
1983	18990000
1984	20480000
1985	20803000
1986	20887000
1987	21707000
1988	22042000
1989	22911000
1990	23756000
1991	23369000
1992	22712000
1993	21611000
1994	21467000
1995	23280000
1996	24599000
1997	25962000
1998	27327000
1999	27812000
2000	27200000
2001	26082000
2002	25244000
2003	25920000
2004	26821000
2005	29818000
2006	28664000
2007	30559000
2008	32644000
2009	34392000
2010	36297000
2011	33697000
2012	35307000
2013	35758000
2014	38322000
2015	39625000
2016	40640000