Year	constant 2015 US$
1992	31336369347.155914
1993	13418831528.355207
1994	11359378202.552914
1995	10228134937.825054
1996	10690015133.873653
1997	11842938806.246698
1998	13151402344.998627
1999	13551304119.442024
2000	14800240614.852093
2001	16312017164.437843
2002	17540503015.29137
2003	19265228932.909157
2004	21740869748.654392
2005	24984588889.139862
2006	28580154278.238045
2007	31582651276.395393
2008	36742886764.9926
2009	35206017338.35028
2010	38014749748.65095
2011	44819787533.895966
2012	46494333582.01926
2013	46368437477.05428
2014	47832621964.85642
2015	45644199338.8615
2016	43060122015.4379
2017	44819428543.39663
2018	46715992233.66341
2019	48051687975.805756
2020	47263171622.99375
2021	48754307395.64642