Year	current US$
1987	28200000.882148795
1988	67699999.63045122
1989	106509997.29707839
1990	122229998.08192253
1991	243400003.25068825
1992	377569999.2645535
1993	454810007.1512163
1994	353349998.9192933
1995	321559999.4845689
1996	328899999.0709127
1997	210270000.45590088
1998	275280001.5844404
1999	263159996.3232874
2000	231360002.03154957
2001	640480003.5804508
2002	354030004.2890013
2003	435700000.45187795
2004	560630005.8830526
2005	493079996.09597033
2006	655549993.2095411
2007	1011020001.6871095
2008	1188819990.709425
2009	1175149979.5429416
2010	974240007.1788583
2011	538049999.3320553
2012	208149999.10071498
2013	205840001.1081249
2014	106210001.36621302
2015	-49270002.09689142
2016	84780000.60468918
2017	142610001.26041466
2018	243060002.50577945
2019	277819999.7525662
2020	309439998.8241493
2021	298869997.0263989
2022	300980000.31895924