Year	current US$
1988	137820000
1989	212319999.99999997
1990	147600000
1991	171477971.40253186
1992	66167406.483053476
1993	60956884.417978525
1994	35953201.01840952
1995	111651424.30856796
1996	156380279.89134344
1997	200110667.68472692
1998	134344746.45953682
1999	185746291.76172704
2000	176735307.76268992
2001	162222045.87363827
2002	168380810.4959612
2003	145753511.34358022
2004	189043681.5945773
2005	183757358.81707624
2006	239771669.0069146
2007	325482806.4035059
2008	386634900.75102586
2009	386106649.8745334
2010	442777811.18585926
2011	537297911.0886352
2012	568335779.2062346
2013	581718727.3407153
2014	575145784.797506
2015	636119093.3511641
2016	614925520.7983685
2017	595553554.5423702
2018	601067059.911202
2019	460423458.58763546
2020	346680286.10425115
2021	427540878.4720725
2022	448828288.52370214
2023	597552318.5165884