Year	constant 2010 US$
1991	1662.96584768449
1992	1544.89971831277
1993	1438.54438266157
1994	1433.82946251977
1995	1461.87119988644
1996	1487.80327945146
1997	1399.3376819368
1998	1476.33983907734
1999	1536.97084993123
2000	1386.19558752844
2001	1450.31220286934
2002	1311.96053755831
2003	1264.65943928296
2004	1218.26195708869
2005	1241.61910118154
2006	1227.48385575214
2007	1251.23977476087
2008	1145.99672486594
2009	1092.21420861841
2010	1172.57143384829
2011	1163.98929094854
2012	1166.71296905033
2013	1199.60386024544
2014	1214.70888843352
2015	1240.29058671118
2016	1258.29654451594
2017	1242.91949011992
2018	1288.86271526489