Year	Total
1985	19249000000
1986	21419000000
1987	23754000000
1988	25508000000
1989	27363000000
1990	28960000000
1991	31889000000
1992	35076000000
1993	35946999999.99999
1994	26741000000
1995	27916000000
1996	28440000000
1997	28943000000
1998	31134000000
1999	29496000000
2000	31329000000
2001	32429000000
2002	34312000000
2003	35506000000
2004	37129000000
2005	38448000000
2006	38611999999.99999
2007	38948000000
2008	37990000000
2009	38728000000
2010	38292000000
2011	39026000000
2012	38751999999.99999
2013	39063000000
2014	39803000000.00001
2015	37977000000
2016	38205000000