Year	Percent
1981	1.03869
1982	1.02201
1983	1.02097
1984	1.01696
1985	1.01965
1986	1.01325
1987	0.99869
1988	1.0085
1989	1.00803
1990	0.99768
1998	1.02404
1999	1.02879
2001	1.03037
2002	1.02637
2003	1.02473
2004	1.02553
2005	1.03008
2006	1.02784
2007	1.02342
2008	1.02144
2009	1.01826
2013	1.01821
2015	1.00883