Year	Percent
1960	3.21942
1961	3.13424
1962	3.07064
1963	3.09174
1964	3.24294
1965	3.41709
1966	3.67757
1967	3.83695
1968	3.63353
1969	2.98066
1970	2.07407
1971	1.09602
1972	0.30545
1973	-0.01284
1974	0.29816
1975	1.06353
1976	1.94784
1977	2.63482
1978	3.15227
1979	3.35546
1980	3.36445
1981	3.3663
1982	3.38357
1983	3.3001
1984	3.12621
1985	2.89615
1986	2.60563
1987	2.32861
1988	2.19849
1989	2.22456
1990	2.35278
1991	2.52973
1992	2.61138
1993	2.45548
1994	2.02206
1995	1.4035
1996	0.72997
1997	0.14573
1998	-0.24361
1999	-0.39064
2000	-0.3568
2001	-0.24884
2002	-0.16998
2003	-0.15622
2004	-0.224
2005	-0.35813
2006	-0.48329
2007	-0.57506
2008	-0.57264
2009	-0.49703
2010	-0.33145
2011	-0.14294
2012	0.03382
2013	0.19208
2014	0.30137
2015	0.40106
2016	0.48145
2017	0.57678