Year	Total
1980	4092000000
1981	4364800000
1982	8047600000
1983	8866000000
1984	8866000000
1985	8866000000
1986	9820800000
1987	13640000000
1988	13640000000
1989	13640000000
1990	13640000000
1991	13640000000
1992	13640000000
1993	13640000000
1994	13640000000
1995	13640000000
1996	15276800000
1997	15345000000
1998	15345000000
1999	15345000000
2000	15345000000
2001	15686000000
2002	15686000000
2003	15686000000
2004	15686000000
2005	15686000000
2006	15686000000
2007	15686000000
2008	15686000000
2009	15686000000
2010	15686000000
2011	19518840000
2012	19136920000
2013	19670244000
2014	19514748000
2015	19437000000
2016	20869200000