Year	Percent
1960	1.35143
1961	2.44729
1962	2.38882
1963	2.33309
1964	2.4846
1965	2.42436
1966	1.78046
1967	1.94181
1968	1.90482
1969	1.86921
1970	1.83491
1971	-0.72993
1972	-0.7353
1973	-0.74074
1974	-0.74627
1975	-0.75188
1976	0.37665
1977	0.37523
1978	0.37383
1979	0.37244
1980	1.60416
1981	0.69268
1982	0.72218
1983	0.86372
1984	0.8776
1985	0.83833
1986	0.84705
1987	0.81055
1988	0.85718
1989	0.84309
1990	0.82088
1991	-0.51543
1992	-0.72439
1993	0.53615
1994	0.69357
1995	0.71557
1996	0.639
1997	0.61015
1998	0.73452
1999	0.55961
2000	0.89021
2001	1.07934
2002	0.65064
2003	0.65433
2004	0.65321
2005	0.64741
2006	0.57353
2007	0.5641
2008	0.59158
2009	0.55459
2010	-0.78312
2011	-0.86362
2012	0.36178
2013	0.31279
2014	0.21208
2015	0.1534
2016	0.15623
2017	0.15293