Year	2010 U.S. Dollars
1974-01-01	45621.3614622116
1975-01-01	43925.2390991564
1976-01-01	50722.6081256912
1977-01-01	54151.7030217820
1978-01-01	55752.5385527440
1979-01-01	66001.5809029995
1980-01-01	59391.9511535856
1981-01-01	46156.2248219058
1982-01-01	46575.7780789852
1983-01-01	45483.6311842018
1984-01-01	44479.3539125007
1985-01-01	42589.6832960567
1986-01-01	40274.3388424821
1987-01-01	39933.7551259678
1988-01-01	39243.0170156511
1989-01-01	37732.3751708754
1990-01-01	37071.7353049910
1991-01-01	37162.5405979061
1992-01-01	37838.3205639022
1993-01-01	36904.4750646566
1994-01-01	37043.1816690002
1995-01-01	37703.7917346160
1996-01-01	37833.3647703949
1997-01-01	36400.0373869634
1998-01-01	35382.1426546445
1999-01-01	35672.3399068870
2000-01-01	35923.4018274107
2001-01-01	36162.9779292315
2002-01-01	36832.2662281767
2003-01-01	37202.3579409858
2004-01-01	36752.0473162980
2005-01-01	36325.1207263069
2006-01-01	37401.0531640605
2007-01-01	36997.8072614836
2008-01-01	35860.3887804149
2009-01-01	34812.7146878375
2010-01-01	35268.1011703581
2011-01-01	36092.0969837904
2012-01-01	35899.0373689733
2013-01-01	34618.9729115639
2014-01-01	33313.8327791027
2015-01-01	32661.8570180811
2016-01-01	31430.9626624001
2017-01-01	31439.9237205960