Year	constant 2010 US$
1991	2726.13795306235
1992	2970.75867504151
1993	3080.55764138113
1994	3550.46822809816
1995	3357.60178272974
1996	3506.8892065971
1997	3860.39188384556
1998	4183.06276353199
1999	4198.15423028482
2000	4598.96992827097
2001	4480.45646123164
2002	4692.64722601213
2003	4942.36800484296
2004	5300.18519556633
2005	5396.98527262977
2006	5431.77264570374
2007	5740.57931022179
2008	4642.56693379741
2009	3997.92896366894
2010	3867.75886372122
2011	4033.47507260089
2012	3823.43327490771
2013	3945.65365365249
2014	4148.52695922015
2015	4352.06822531987
2016	4087.16779353781
2017	4225.51343377801
2018	4225.49350263646