Year	current US$
1987	1800000000
1988	1900000000
1989	2100000000
1990	2200000000
1991	1950000000
1993	1384126984.1269841
1997	2251370575.281013
1998	2488897008.7172823
1999	2235315127.513646
2000	1597417613.6158247
2001	2368409004.2342763
2002	2615776586.8732114
2003	4234674588.9597707
2004	5200513478.462252
2005	4962522005.444646
2006	4519124480.369514
2007	5816248545.9662285
2008	8543266342.033502
2009	4385060561.403508
2010	2749094210.5263157
2011	4216896701.754386
2012	7391154701.754386