Year	current US$
1999	20282583054.182278
2000	20466141200.582592
2001	20609434979.385418
2002	21170767633.53865
2003	26063762063.31053
2004	30634010117.82873
2005	35382849949.59081
2006	39782540496.611435
2007	49293530836.67999
2008	58870011384.72806
2009	49075172440.78531
2010	46639890593.23999
2011	52759785028.82255
2012	49388847914.75232
2013	52427847626.57662
2014	54406256970.97574
2015	47288934511.97996
2016	51301453985.23991
2017	58829311855.63863
2018	64718122568.45123
2019	65843484713.77941