Year	Total
1970	9944000
1971	12418000
1972	14831000
1973	16667000
1974	17494000
1975	15920000
1976	16766000
1977	17006000
1978	18186000
1979	18243000
1980	16670000
1981	17229000
1982	12226000
1983	13006000
1984	13600000
1985	12342000
1986	10618000
1987	12701000
1988	11820000
1989	11410000
1990	11540000
1991	13240000
1992	13430000
1993	13365000
1994	14011000
1995	14458000
1996	15657000
1997	15391000
1998	15039000
1999	16063000
2000	15192000
2001	15337000
2002	15297000
2003	15923000
2004	14735000
2005	14227000
2006	14054000
2007	12874000
2008	11726000
2009	10962000
2010	9566600
2011	9000300
2012	8136800
2013	7399500
2014	6951200
2015	6471000
2016	5953800