Year	Percent
1970	1.02011
1971	1.02331
1972	1.02954
1973	1.03595
1975	1.06898
1977	1.04418
1979	1.09075
1980	1.08797
1982	1.08594
1983	1.09628
1984	1.12017
1985	1.24332
1986	1.21257
1987	1.20919
1988	1.21999
1989	1.19835
1998	1.0781
1999	1.06707
2000	1.06812
2001	1.06706
2002	1.05316
2004	1.04009
2005	1.03834
2006	1.03815
2007	1.04215
2008	1.04245
2010	1.03535