Year	Total
1980	2520000000
1981	2547000000
1982	2830500000
1983	3060000000
1984	3852000000
1985	3996000000
1986	3996000000
1987	3996000000
1988	4158900000
1989	4158000000
1990	4153500000
1991	5785200000
1992	6041700000
1993	6363000000
1994	6363000000
1995	7650000000
1996	7650000000
1997	7650000000
1998	9810000000
1999	10041300000
2000	12998700000
2001	23204700000
2002	23204700000
2003	22808700000
2004	22824900000
2005	23072400000
2006	22988700000
2007	22918500000
2008	22828500000
2009	22789800000
2010	22542300000
2011	22542300000
2012	22399200000
2013	22210200000
2014	22075200000
2015	21869100000
2016	21869100000