Year	current US$
1999	16770842916.985079
2000	24644939225.981384
2001	6146407704.791016
2002	5697140755.93077
2003	6348926399.937464
2004	7225501869.26004
2005	8629583248.10797
2006	9989329578.829527
2007	12054684207.791908
2008	15911961079.420525
2009	11839319765.491455
2010	16659926373.49432
2011	21251206317.572994
2012	19441132397.30408
2013	18422483003.311142
2014	23602707886.098934
2015	13330846130.673302
2016	12470063544.545952
2017	13926944060.644941
2018	13769360893.588572
2019	12389098614.052208
2020	10357999255.384266
2021	15252546192.779148
2022	23126283166.0064
2023	18652524971.615566