Year	National currency per current international dollar
1980	2.707
1981	2.925
1982	2.808
1983	2.834
1984	3.007
1985	3.001
1986	3.709
1987	4.568
1988	5.702
1989	6.559
1990	7.359
1991	7.464
1992	7.687
1993	7.783
1994	8.833
1995	9.258
1996	10.684
1997	11.459
1998	11.382
1999	12.001
2000	13.269
2001	13.357
2002	13.743
2003	13.232
2004	14.216
2005	15.434
2006	16.343
2007	17.63
2008	20.052
2009	19.347
2010	20.476