Year	constant 2010 US$
1991	34529.8697609659
1992	33655.1670426882
1993	32875.5869241691
1994	32349.4685977379
1995	31278.1252590124
1996	30439.6234653133
1997	29182.7022673791
1998	27669.4422240819
1999	27140.2057274581
2000	26474.0649113223
2001	25259.0470955273
2002	24555.9395390923
2003	23923.8945510824
2004	23171.7981960503
2005	22398.7146993495
2006	23626.3377891687
2007	23790.3318394198
2008	24204.97379502
2009	22928.7419051152
2010	23393.4422795519
2011	23810.3815014596
2012	24575.3287120533
2013	25101.0470290097
2014	25075.8692210615
2015	24994.5261802871
2016	24855.3701871461
2017	25252.6880886932