Year	US Dollar per National Currency Units
1960-01-01	6.953918652
1961-01-01	6.961136004
1962-01-01	6.949107084
1963-01-01	6.939483948
1964-01-01	6.925049244
1965-01-01	6.953918652
1966-01-01	6.918032374
1967-01-01	6.946701300
1968-01-01	6.968353356
1969-01-01	6.997623728
1970-01-01	6.973365406
1971-01-01	7.274288888
1972-01-01	7.425251834
1973-01-01	7.757049544
1974-01-01	8.150996674
1975-01-01	7.297745282
1976-01-01	6.354677954
1977-01-01	5.030293862
1978-01-01	4.357275788
1979-01-01	4.027282416
1980-01-01	3.779887628
1981-01-01	3.072587132
1982-01-01	2.251011896
1983-01-01	1.525066574
1984-01-01	1.184247174
1985-01-01	1.273060700
1986-01-01	1.372098808
1987-01-01	1.543711400
1988-01-01	1.369693024
1989-01-01	1.338016868
1990-01-01	1.500607770
1991-01-01	1.493991864
1992-01-01	1.366084348
1993-01-01	1.133926192
1994-01-01	1.260229852
1995-01-01	1.341826026
1996-01-01	1.281881908
1997-01-01	1.093629310
1998-01-01	1.166805240
1999-01-01	1.004600000
2000-01-01	0.930500000
2001-01-01	0.881300000
2002-01-01	1.048700000
2003-01-01	1.263000000
2004-01-01	1.362100000
2005-01-01	1.179700000
2006-01-01	1.317000000
2007-01-01	1.472100000
2008-01-01	1.391700000
2009-01-01	1.440600000
2010-01-01	1.336200000
2011-01-01	1.293900000
2012-01-01	1.319400000
2013-01-01	1.379100000
2014-01-01	1.214100000
2015-01-01	1.088700000
2016-01-01	1.054100000
2017-01-01	1.199300000