Year	current US$
1995	4012851335.58489
1996	4254384095.79367
1997	4423757691.1268
1998	4494914645.37918
1999	4527987595.94719
2000	5148355971.75315
2001	4807604359.84034
2002	5005039852.62511
2003	6604568007.36874
2004	8719232422.47467
2005	10325776051.5812
2006	12100691065.3976
2007	14800646484.4949
2008	16321000000
2009	14969000000
2010	18937000000
2011	22975000000
2012	23886000000
2013	25794000000
2014	28722000000
2015	29922300000
2016	32053300000
2017	37902000000