Year	current US$
1995	18719978709.341583
1996	21624399434.346252
1997	23451239137.64384
1998	24219707195.884415
1999	22136235766.727448
2000	24965154249.398792
2001	24138606580.750664
2002	21320510884.241974
2003	21898993821.230217
2004	24966361497.682667
2005	29429632890.50102
2006	32830891081.24272
2007	39110446416.248985
2008	44504990749.52471
2009	42370907402.16992
2010	50732249979.88326
2011	60973235241.953865
2012	66934991171.79325
2013	73764661299.92067
2014	74797509366.71301
2015	66122692783.71372
2016	66731592400.714836
2017	77049312751.96877
2018	77084923602.84103
2019	72084531612.91078