Year	constant 2010 US$
1968	838.6928962655
1969	915.83805019831
1970	1006.60951629155
1971	1074.44063234271
1972	1080.15350640093
1973	1095.24906655194
1974	1161.7548726598
1975	1125.50457898741
1976	1174.75253362285
1977	1194.11532744668
1978	1155.44527808956
1979	1192.07726281538
1980	1215.52939567839
1981	1132.66331533795
1982	1091.02214886849
1983	1008.6015629945
1984	988.43574507892
1985	998.862882895744
1986	997.000946667491
1987	1009.78129336231
1988	1019.33218395644
1989	1006.29753282624
1990	1074.8175719894
1991	938.72131383602
1992	938.028090184757
1993	908.17654610385
1994	882.842557064224
1995	885.167025628576
1996	912.74824181394
1997	942.245624749221
1998	988.764146100862
1999	1008.34327158365
2000	1010.39390180711
2001	1030.01379781636
2002	1061.75375883587
2003	1028.0793665307
2004	1127.75699524516
2005	1170.54915331172
2006	1219.9970708682
2007	1264.27331411957
2008	1313.88678200502
2009	1342.1113415417
2010	1386.53892248068
2011	1408.56407721141
2012	1445.34796594932
2013	1487.56581368382
2014	1514.52759700685
2015	1517.05681466406
2016	1515.38775920208
2017	1499.01344481185
2018	1490.45903340143