Year	Years
1970	0.29
1971	0.3
1972	0.31
1973	0.32
1974	0.33
1975	0.34
1976	0.35
1977	0.36
1978	0.37
1979	0.38
1980	0.39
1981	0.4
1982	0.41
1983	0.42
1984	0.44
1985	0.45
1986	0.46
1987	0.48
1988	0.49
1989	0.5
1990	0.52
1991	0.53
1992	0.55
1993	0.56
1994	0.58
1995	0.6
1996	0.61
1997	0.63
1998	0.65
1999	0.67
2000	0.69
2001	0.71
2002	0.72
2003	0.75
2004	0.77
2005	0.79
2006	0.81
2007	0.83
2008	0.85
2009	0.88
2010	0.9
2011	0.93
2012	0.95
2013	0.98
2014	1.01
2015	1.03