Year	current US$
1987	43800000.78678133
1988	84210000.63419348
1989	153489999.02419743
1990	369539997.71736574
1991	521499999.05563885
1992	864200004.028157
1993	770490013.3851922
1994	618739997.9345505
1995	420159999.49723494
1996	486259996.79602695
1997	393009999.6011704
1998	422789999.79235226
1999	445769997.3192065
2000	370710000.5429236
2001	444219998.7694621
2002	531990001.0786951
2003	568570001.8946084
2004	664720001.0661035
2005	755099996.7716637
2006	1124489985.0450454
2007	1346549996.9758093
2008	1685619998.56867
2009	1601899985.4661524
2010	1109609999.338165
2011	606350002.6483086
2012	235420000.0334531
2013	193720000.38810083
2014	93000001.56462196
2015	-160540001.94929543
2016	37329999.64989744
2017	118529996.77695331
2018	183350003.0152502
2019	229719998.83279216
2020	209749999.05377635
2021	268249997.98648065
2022	324050002.55629414