Year	Total
1965	18949000
1966	21483000
1967	21023000
1968	23758000
1969	26804000
1970	29260000
1971	27465000
1972	28312000
1973	29215000
1974	26332000
1975	26225000
1976	29039000
1977	28049000
1978	26601000
1979	27873000
1980	24780000
1981	22384000
1982	21000000
1983	18575000
1984	17784000
1985	19153000
1986	19719000
1987	18070000
1988	17309000
1989	17346000
1990	17404000
1991	16419000
1992	17394000
1993	16954000
1994	17961000
1995	17085000
1996	18463000
1997	17077000
1998	17185000
1999	17104000
2000	15898000
2001	16002000
2002	16477000
2003	17721000
2004	17517000
2005	17161000
2006	17252000
2007	16873000
2008	16671000
2009	15473000
2010	16175000
2011	14838000
2012	14631000
2013	14359000
2014	14466000
2015	14128000
2016	14693000