Year	current US$
1987	2700000000
1988	2800000000
1989	3100000000
1990	3400000000
1991	3300000000
1993	2558730158.730159
1997	3199089444.414425
1998	3674350579.228217
1999	3207476083.93625
2000	2606458607.574592
2001	3489379505.4749517
2002	3845497606.4922323
2003	5754064418.103881
2004	6777000926.3547945
2005	6819903493.647913
2006	6523277043.879908
2007	8171783255.159473
2008	14652339189.71562
2009	13804964421.052631
2010	14465423333.333332
2011	19398305824.5614
2012	23988662070.175438