Year	Percent
1960	1.99393
1961	0.66838
1962	0.67662
1963	0.72955
1964	0.82262
1965	0.84211
1966	0.7773
1967	0.72378
1968	0.63174
1969	0.56606
1970	0.52888
1971	0.46645
1972	0.56771
1973	0.67819
1974	0.65439
1975	0.59725
1976	0.49885
1977	0.42472
1978	0.35631
1979	0.28915
1980	0.206
1981	0.12005
1982	0.07408
1983	0.03629
1984	0.02235
1985	0.0289
1986	0.00545
1987	0.01021
1988	0.04832
1989	0.07501
1990	0.08371
1991	0.06923
1992	0.06792
1993	0.06114
1994	0.02037
1995	0.00159
1996	0.0281
1997	0.05291
1998	0.02877
1999	0.01682
2000	0.0453
2001	0.05617
2002	0.14892
2003	0.44451
2004	0.64718
2005	0.49139
2006	0.30056
2007	0.50493
2008	0.66247
2009	0.45561
2010	0.30759
2011	0.17198
2012	0.26954
2013	1.15925
2014	0.9175
2015	-0.09638
2016	-0.16988
2017	-0.12557