Year	current US$
1998	-965559453.848134
1999	-983982867.369077
2000	-1381426368.52763
2001	-847869019.8432
2002	-303304793.709324
2003	22348388.9645505
2004	186071062.520664
2005	1121903399.83876
2006	2404495469.63311
2007	4501319013.9315
2008	7914301924.05807
2009	6778283630.23083
2010	11140247873.7301
2011	13933565667.4098
2012	14664177719.3143
2013	15259334382.0482
2014	15958325666.8887
2015	6917149165.65928
2016	2374294941.0756
2017	4055510849.72976
2018	4006317726.96083
2019	3671312811.89507
2020	3390975244.06403
2021	4963248725.99826