Year	Percent
1960	2.02674
1961	1.98647
1962	2.85734
1963	2.77796
1964	2.70287
1965	2.63173
1966	2.56424
1967	2.58827
1968	2.43702
1969	2.37904
1970	2.32376
1971	2.27098
1972	2.45557
1973	2.32029
1974	2.34238
1975	2.21575
1976	2.23917
1977	2.12022
1978	2.0762
1979	2.10106
1980	1.9921
1981	2.01764
1982	1.91454
1983	2.00257
1984	2.02399
1985	2.10281
1986	2.0595
1987	2.075
1988	2.14455
1989	1.99012
1990	1.89759
1991	1.91495
1992	1.7755
1993	1.69365
1994	1.61538
1995	1.5897
1996	1.46774
1997	1.30279
1998	-5.92473
1999	-10.95515
2000	-3.58213
2001	0.06786
2002	0.06793
2003	0.06788
2004	0.06784
2005	0.06791
2006	0.8032
2007	0.80326
2008	0.80321
2009	0.80317
2010	0.80325
2011	0.85907
2012	0.78973
2013	1.04153
2014	-0.12617
2015	-1.10389
2016	0.79602
2017	0.7952