Year	constant 2010 US$
1997	229.459794622051
1998	238.788686009752
1999	232.203308593948
2000	232.754156899205
2001	225.697754694475
2002	228.896193526185
2003	218.102535556774
2004	219.94504207951
2005	217.622285502523
2006	224.080711831193
2007	224.898695341371
2008	228.559518202985
2009	228.008457567496
2010	232.990034895921
2011	234.177219579907
2012	238.176597139583
2013	243.059723167033
2014	244.735085337432
2015	228.320347872921
2016	219.919876643761