Year	current US$
1974	123772881.938299
1990	137225511.439521
1991	135365206.54959
1992	108678922.747979
1993	58328767.1352169
1994	88382526.4039831
1995	54019782.2835845
1996	17118344.8596181
1997	44589404.0429719
1998	-25550958.0198664
1999	-40133571.8909646
2000	124777054.333093
2001	201399149.95681
2002	121128332.280338
2003	162860046.131717
2004	141558078.053894
2005	368865065.025514
2006	247334218.9106
2007	343220966.348969
2008	7579470.79205513
2009	-200174800.840123
2010	-438168759.135289
2011	-866688035.908505
2012	-300323051.174964
2013	22528530.813711
2014	84181825.041541
2015	76109696.5106423
2016	12971374.3957928
2017	-45774105.6403844
2018	35855058.7230089
2019	-74753584.7693572
2020	-42073489.999252
2021	104306290.088897