Year	current US$
1998	28301997.765012644
1999	34646523.33914391
2000	33426973.17566409
2001	32529892.47311828
2002	30625366.756367695
2003	35592353.289387755
2004	41819482.959119774
2005	47379381.50922424
2006	51897656.988898486
2007	69603416.71751067
2008	82834844.83570088
2009	76896533.11961694
2010	71884217.74363159
2011	85068412.45096202
2012	82439616.78585885
2013	85538249.99338922
2014	86863657.13694811
2015	79989601.16834365
2016	78257663.05600369
2017	96864397.25428574
2018	108128716.01688376