Year	current US$
1999	5536266339.12488
2000	4989998672.75386
2001	4706695796.40739
2002	4691829991.6673
2003	4976405020.54222
2004	9190088323.09155
2005	11111105294.7019
2006	9524502822.75841
2007	15830234140.825
2008	13504569638.216
2009	1402943035.27659
2010	5233104380.45919
2011	5913485997.41011
2012	10007759562.9455
2013	9044708968.58248
2014	10802069717.2348
2015	5491072400.90233
2016	6650011034.39743
2017	8343230876.72641
2018	7973665899.26361
2019	5118349661.46359
2020	7772161478.09167
2021	12155827386.4726