Year	current US$
1990	2868857010.67736
1991	3177325852.82427
1992	3368517876.69555
1993	3040467187.2196
1994	2796876348.8002
1995	2720228371.84614
1996	2937010940.5374
1997	3281636268.88412
1998	2956843319.07324
1999	3930239967.06675
2000	3957050778.23188
2001	3520085274.00986
2002	1974192280.1202
2003	2465534430.48635
2004	2985252162.73433
2005	3983196701.10906
2006	5117801294.35506
2007	5814140433.92412
2008	7415230945.38611
2009	5408592132.54148
2010	7052299898.52815
2011	4259573019.12862
2012	8313447436.18578
2013	7069662155.06182
2014	5487449053.61191
2015	4763071452.81901
2016	4777254826.84094
2017	6337601926.22036
2018	7327313202.36115
2019	6081833318.20162
2020	4891165248.63158
2021	4210845584.75592