Year	Total
1965	35326000
1966	35222000
1967	34062000
1968	35259000
1969	36647000
1970	37100000
1971	38653000
1972	38102000
1973	37283000
1974	37145000
1975	37938000
1976	38678000
1977	39514000
1978	39668000
1979	39680000
1980	38451000
1981	38295000
1982	38592000
1983	38375000
1984	39098000
1985	38249000
1986	38076000
1987	37633000
1988	38074000
1989	36608000
1990	31455000
1991	28878000
1992	25823000
1993	24610000
1994	22841000
1995	22660000
1996	22564000
1997	23173000
1998	21254000
1999	18408000
2000	21643000
2001	21185000
2002	20792000
2003	21044000
2004	20983000
2005	20247000
2006	21035000
2007	21389000
2008	19741000
2009	17655000
2010	18768000
2011	18414000
2012	17407000
2013	17203000
2014	16037000
2015	16580000
2016	16900000