Year	Total
1965	13765000
1966	14644000
1967	15962000
1968	17488000
1969	18107000
1970	20001000
1971	21571000
1972	22218000
1973	21601000
1974	21145000
1975	20261000
1976	20414000
1977	22062000
1978	23210000
1979	24278000
1980	25267000
1981	25736000
1982	25571000
1983	25667000
1984	25142000
1985	24159000
1986	22869000
1987	22573000
1988	23720000
1989	24230000
1990	25437000
1991	25882000
1992	29040000
1993	31068000
1994	34511000
1995	37457000
1996	40816000
1997	43386000
1998	44028000
1999	41684000
2000	41379000
2001	43987000
2002	43329000
2003	43171000
2004	41113000
2005	39446000
2006	39525000
2007	38257000
2008	37823000
2009	34009000
2010	33349000
2011	30920000
2012	31061000
2013	30485000
2014	29881000
2015	29832000
2016	28799000