Year	Total
1968	1048600
1969	2639200
1970	4232600
1971	5278300
1972	5842000
1973	5527300
1974	6423600
1975	9560700
1976	10036000
1977	9112600
1978	8913400
1979	8315800
1980	7889200
1981	8166400
1982	7718300
1983	8017100
1984	8088900
1985	7932500
1986	9979100
1987	11483000
1988	13372000
1989	16936000
1990	20225000
1991	23470000
1992	25635000
1993	28128000
1994	27986000
1995	29612000
1996	29193000
1997	28667000
1998	28618000
1999	28752000
2000	28096000
2001	29901000
2002	32740000
2003	31550000
2004	23490000
2005	21667000
2006	20322000
2007	19476000
2008	19629000
2009	19326000
2010	18530000
2011	16949000
2012	8078800
2013	2686500
2014	1459900
2015	1197800
2016	1101300