Year	2010 U.S. Dollars
1980-01-01	190.479472444434
1981-01-01	195.309704424659
1982-01-01	177.786616017942
1983-01-01	146.932153597620
1984-01-01	135.285940714812
1985-01-01	135.264189557271
1986-01-01	131.646380980575
1987-01-01	151.155232669017
1988-01-01	163.780237896230
1989-01-01	173.663859722512
1990-01-01	172.910866337086
1991-01-01	176.788567559002
1992-01-01	161.833815902723
1993-01-01	169.218234282795
1994-01-01	172.792561798687
1995-01-01	170.581708907845
1996-01-01	209.861657003139
1997-01-01	226.303923316425
1998-01-01	246.710098861050
1999-01-01	259.231825347606
2000-01-01	256.539379736227
2001-01-01	281.067691329025
2002-01-01	296.983486342821
2003-01-01	307.034073405739
2004-01-01	321.302880361857
2005-01-01	339.132244173654
2006-01-01	361.745037616069
2007-01-01	377.383271912345
2008-01-01	391.710147288148
2009-01-01	404.596955028334
2010-01-01	419.225814942685
2011-01-01	436.143181546185
2012-01-01	454.106823967563
2013-01-01	472.590637038848
2014-01-01	493.253301412066
2015-01-01	510.793590648738
2016-01-01	514.961539189252
2017-01-01	518.960877316604