Year	constant 2010 US$
1968	1160.66478948625
1969	1105.87711916862
1970	1229.1371878267
1971	1205.8677785769
1972	1172.1669927729
1973	1116.76707392016
1974	1234.48769815187
1975	1074.442366592
1976	1058.88861301858
1977	1056.95908695135
1978	1062.36626066482
1979	1084.94548382767
1980	1103.42055855674
1981	1076.55632103238
1982	1026.26367541741
1983	1017.78260044511
1984	980.771020847069
1985	961.20131056712
1986	974.577454265374
1987	968.427646438706
1988	972.791005881429
1989	1001.17595434929
1990	961.7834778721
1991	970.584768840049
1992	966.634685109966
1993	989.424561579925
1994	933.388054258093
1995	999.461387650858
1996	1095.57425774535
1997	1021.08183647545
1998	1030.64549578481
1999	1084.00375901755
2000	1041.2657022363
2001	999.824786909167
2002	1043.27363475911
2003	1070.87935444289
2004	1099.73419120432
2005	1158.21465424627
2006	1262.63090133109
2007	1271.40849014836
2008	1266.45010354359
2009	1244.60701745795
2010	1221.7084086376
2011	1214.96759554791
2012	1240.21803696306
2013	1282.3101593013
2014	1304.92619827128
2015	1302.55286156668
2016	1307.52561121624
2017	1323.98618465984
2018	1347.03813854447