Year	Total
1985	4558000000
1986	5012000000
1987	5384000000
1988	5641000000
1989	5769000000
1990	6348900000
1991	6974500000
1992	7196000000
1993	7411300000
1994	8144000000
1995	8428600000
1996	9679200000
1997	10362000000
1998	10890000000
1999	10308000000
2000	10612000000
2001	11050000000
2002	11888000000
2003	11546000000
2004	12585000000
2005	13404000000
2006	15116000000
2007	17337000000
2008	18609000000
2009	18265000000
2010	19510000000
2011	20544000000
2012	22848000000
2013	23260000000
2014	24307000000
2015	25950000000
2016	27078000000