Year	constant 2010 US$
1981	1383.91754867772
1982	1330.98069264039
1983	1248.02456381944
1984	1245.47431384419
1985	1221.81784320161
1986	1201.10689397358
1987	1199.70255834882
1988	1224.63813998534
1989	1214.04636346436
1990	1211.25043403596
1991	1186.980201152
1992	1163.91054671181
1993	1131.486871224
1994	1121.01330512518
1995	1121.71114172646
1996	1144.95353901706
1997	1154.38691327848
1998	1150.73952986857
1999	1142.73939069941
2000	1134.79926629764
2001	1158.92197975079
2002	1216.27657438882
2003	1238.52954001098
2004	1279.58879454502
2005	1319.61635062526
2006	1386.76016263305
2007	1425.17802296881
2008	1457.46550034502
2009	1472.7159021343
2010	1500.63390836697
2011	1525.05945300787
2012	1550.24304101343
2013	1565.60164452159
2014	1626.00078262274
2015	1640.83989765059
2016	1615.59678565608
2017	1603.87443499911