Year	Percent
1960	5.11624
1961	5.26882
1962	5.69002
1963	5.6086
1964	5.46114
1965	5.24326
1966	5.0262
1967	4.8346
1968	4.69051
1969	4.60517
1970	4.58479
1971	4.41342
1972	3.94012
1973	3.8926
1974	3.8246
1975	3.72774
1976	3.62099
1977	3.51647
1978	3.45971
1979	3.4516
1980	3.47343
1981	3.07316
1982	1.90029
1983	1.88496
1984	1.86903
1985	1.82317
1986	1.85678
1987	1.83426
1988	1.52414
1989	0.82569
1990	-0.10925
1991	-1.24388
1992	-2.29892
1993	-2.85909
1994	-2.69574
1995	-1.93284
1996	-0.89758
1997	0.0137
1998	0.70059
1999	0.97909
2000	0.94768
2001	0.85957
2002	0.85723
2003	0.82302
2004	0.78516
2005	0.7301
2006	0.66388
2007	0.57304
2008	0.43671
2009	0.25391
2010	0.04719
2011	-0.19657
2012	-0.41121
2013	-0.50101
2014	-0.39996
2015	-0.13755
2016	0.1858
2017	0.4715