Year	current US$
1998	2145382464.4298
1999	1761074345.96754
2000	1207085468.99922
2001	1402502737.82259
2002	2271902763.7572
2003	3179340891.56053
2004	3736589923.1158
2005	3912944601.02719
2006	4840745676.90281
2007	7546550747.96174
2008	9863102497.56044
2009	13767827640.6347
2010	14913379817.7008
2011	17403035681.0347
2018	29204779058.2334
2019	34053813931.7606