Year	Percent
1960	5.87661
1961	5.6947
1962	5.5337
1963	5.37589
1964	5.15235
1965	5.00262
1966	4.8307
1967	4.66214
1968	4.49955
1969	4.43285
1970	4.16867
1971	3.93271
1972	3.85214
1973	3.79705
1974	3.68979
1975	3.4881
1976	3.35648
1977	3.15753
1978	3.08896
1979	2.89047
1980	2.75431
1981	2.80454
1982	2.83428
1983	2.8272
1984	2.7965
1985	2.70153
1986	2.61595
1987	2.5557
1988	2.41939
1989	1.36058
1990	0.2059
1991	0.01712
1992	-0.14763
1993	-0.33705
1994	-0.47302
1995	-0.63243
1996	-0.40343
1997	-1.24597
1998	-0.9243
1999	-1.04651
2000	-1.10311
2001	-1.12476
2002	-1.1409
2003	-1.19928
2004	-1.1713
2005	-0.7447
2006	-0.35039
2007	-0.30429
2008	-0.26301
2009	-0.19885
2010	-0.17256
2011	-0.13064
2012	-0.08591
2013	-0.09966
2014	-0.1339
2015	-0.0785
2016	-0.01119
2017	0.04608