Year	Total
1980	5391619200
1981	5479870000
1982	5498556800
1983	5522972400
1984	5528564800
1985	5584079600
1986	5606312800
1987	5619816400
1988	5656235200
1989	5632774400
1990	5496101600
1991	5469367200
1992	5406077600
1993	5387254400
1994	6567523600
1995	6597258800
1996	6675825200
1997	6656729200
1998	6795857200
1999	24764784000
2000	24756600000
2001	24680216000
2002	24606560000
2003	24538360000
2004	24494712000
2005	24557456000
2006	24464704000
2007	24392412000
2008	24054140000
2009	23872728000
2010	23849540000
2011	23758152000
2012	23695408000
2013	23602656000
2014	23482624000
2015	23393964000
2016	23393964000