Year	Percent
1971	1.03294
1972	1.03225
1973	1.03664
1974	1.04448
1975	1.04423
1984	1.06071
1985	1.05972
1986	1.05566
1987	1.05617
1988	1.05686
1989	1.06038
1991	1.05186
1992	1.0465
1993	1.04729
1999	1.05114
2000	1.04656
2001	1.04143
2002	1.03844
2003	1.03604
2004	1.03374
2005	1.03295
2006	1.03038
2007	1.02567
2008	1.02165
2009	1.01843
2010	1.01843
2011	1.01939
2012	1.02266
2013	1.02682
2014	1.01838
2015	1.01495
2016	1.01545