Year	constant 2010 US$
1991	3520.65165571171
1992	3561.52149368603
1993	3507.96313133111
1994	3434.34162770894
1995	4077.9356411337
1996	3868.08534928323
1997	2997.67711049832
1998	2375.18140461843
1999	2519.90611928754
2000	2099.56173267947
2001	2262.9849669274
2002	1758.98017689255
2003	2066.92849621917
2004	1884.77868949493
2005	1664.87687595168
2006	1720.49074302025
2007	1812.10902835254
2008	1750.12751646492
2009	1787.7021996985
2010	1996.9934764587
2011	1849.11158120046
2012	1615.02452830326
2013	1572.51588053724
2014	1553.99368174807
2015	1543.87252200683
2016	1527.66697539518
2017	1527.22360787246
2018	1543.80895828444