Year	current US$
1995	16935141517.458742
1996	19508818605.179348
1997	20583305873.69745
1998	21537228599.442535
1999	19635504577.20848
2000	21817794107.014618
2001	21151119465.796677
2002	18891153594.878983
2003	19511956127.756237
2004	21978856176.299683
2005	25560958147.614418
2006	28175668323.033398
2007	33029956765.663105
2008	37479199830.06403
2009	35514927903.407974
2010	42179675198.64789
2011	50375217392.866295
2012	54229404587.82848
2013	59879497545.4641
2014	61654230906.76345
2015	54688114700.607056
2016	55672618817.41033
2017	63652397511.29926
2018	63553929575.14474
2019	59777128924.61618