Year	US Dollar per National Currency Units
1960-01-01	0.5284230406
1961-01-01	0.5319043965
1962-01-01	0.5319043965
1963-01-01	0.5319043965
1964-01-01	0.5319043965
1965-01-01	0.5314915875
1966-01-01	0.5310787785
1967-01-01	0.5316979920
1968-01-01	0.5316979920
1969-01-01	0.5316979920
1970-01-01	0.5316979920
1971-01-01	0.5803544128
1972-01-01	0.5946513645
1973-01-01	0.6932163934
1974-01-01	0.8032850331
1975-01-01	0.7434002075
1976-01-01	0.8206505317
1977-01-01	0.9091705416
1978-01-01	1.0293805224
1979-01-01	1.1069335732
1980-01-01	0.9964796451
1981-01-01	0.8662384056
1982-01-01	0.8246134981
1983-01-01	0.7114625512
1984-01-01	0.6240433653
1985-01-01	0.7963085610
1986-01-01	1.0036625217
1987-01-01	1.2231393067
1988-01-01	1.0951272358
1989-01-01	1.1646442714
1990-01-01	1.2887759377
1991-01-01	1.2873311062
1992-01-01	1.2119384225
1993-01-01	1.1331882256
1994-01-01	1.2402295993
1995-01-01	1.3640310184
1996-01-01	1.2561915473
1997-01-01	1.0892378274
1998-01-01	1.1713868184
1999-01-01	1.0046000000
2000-01-01	0.9305000000
2001-01-01	0.8813000000
2002-01-01	1.0487000000
2003-01-01	1.2630000000
2004-01-01	1.3621000000
2005-01-01	1.1797000000
2006-01-01	1.3170000000
2007-01-01	1.4721000000
2008-01-01	1.3917000000
2009-01-01	1.4406000000
2010-01-01	1.3362000000
2011-01-01	1.2939000000
2012-01-01	1.3194000000
2013-01-01	1.3791000000
2014-01-01	1.2141000000
2015-01-01	1.0887000000
2016-01-01	1.0541000000
2017-01-01	1.1993000000