Year	Percent
1960	1.79533
1961	1.94872
1962	1.85337
1963	1.77979
1964	1.77777
1965	1.73268
1966	1.69345
1967	1.61344
1968	1.3677
1969	0.92922
1970	0.52427
1971	0.8087
1972	1.46378
1973	1.50909
1974	1.35292
1975	1.27891
1976	0.99286
1977	0.74443
1978	0.78054
1979	0.97848
1980	1.0589
1981	1.14058
1982	1.33661
1983	1.32404
1984	1.06363
1985	0.78767
1986	0.73259
1987	1.09563
1988	1.56622
1989	1.2384
1990	0.77766
1991	1.15915
1992	1.25663
1993	1.01681
1994	0.86684
1995	0.54247
1996	0.53991
1997	0.8192
1998	1.07086
1999	1.20924
2000	1.36919
2001	1.3293
2002	0.8926
2003	0.6925
2004	0.87794
2005	1.58289
2006	2.34742
2007	2.53009
2008	1.85957
2009	0.34124
2010	-0.1439
2011	0.30547
2012	0.5321
2013	0.94589
2014	1.1125
2015	1.04194
2016	1.38808
2017	1.72749