Year	2010 U.S. Dollars
1970-01-01	488.413509332783
1971-01-01	459.987693033566
1972-01-01	479.258310540345
1973-01-01	475.101044470055
1974-01-01	488.580067994870
1975-01-01	520.464976546722
1976-01-01	542.233418756851
1977-01-01	501.692736857621
1978-01-01	566.292001270800
1979-01-01	574.693339584069
1980-01-01	477.953094748764
1981-01-01	555.318263600531
1982-01-01	566.021547817322
1983-01-01	533.057837353419
1984-01-01	566.518935269321
1985-01-01	575.272557987497
1986-01-01	557.010085288753
1987-01-01	559.805801751798
1988-01-01	572.141851184626
1989-01-01	593.054710192855
1990-01-01	614.461883085147
1991-01-01	630.310663668050
1992-01-01	621.867599368119
1993-01-01	619.896601118639
1994-01-01	625.386789047704
1995-01-01	639.364253843724
1996-01-01	700.025225167913
1997-01-01	732.466382408408
1998-01-01	517.782951038083
1999-01-01	514.146651908346
2000-01-01	532.267639015212
2001-01-01	533.498089176632
2002-01-01	517.619949194439
2003-01-01	509.656954985628
2004-01-01	512.427534323821
2005-01-01	522.489531198141
2006-01-01	522.510795458898
2007-01-01	527.138279802549
2008-01-01	531.210330810853
2009-01-01	535.859993820582
2010-01-01	546.721668646992
2011-01-01	576.012802830765
2012-01-01	551.637341912840
2013-01-01	554.911494727356
2014-01-01	545.898485529530
2015-01-01	564.729954904838
2016-01-01	585.168306942950
2017-01-01	604.624544213481