Year	current US$
1987	29300000.905990656
1988	70409999.66859818
1989	137829998.09272584
1990	219369999.32490295
1991	315010002.253577
1992	427209997.3019215
1993	532680007.4670465
1994	437450001.3366342
1995	394570001.143962
1996	387649998.4376133
1997	286589998.9735335
1998	362230003.0570476
1999	320259996.6377019
2000	307010005.187243
2001	717610001.9812583
2002	422830004.3363124
2003	547670001.01693
2004	718880003.834143
2005	641139996.4652956
2006	846039994.9084971
2007	1253269999.6400626
2008	1574189992.7780044
2009	1574059983.244166
2010	1222950000.5114825
2011	671449996.4918941
2012	266030000.12785196
2013	201160002.19434506
2014	148080002.46249145
2015	-78720001.03630127
2016	125770000.02376744
2017	218129998.8366664
2018	246890003.10748833
2019	259560001.41613173
2020	238100000.4149972
2021	272919994.84226125
2022	272029996.2665885