Year	Percent
1960	3.11793
1961	2.20966
1962	1.37987
1963	0.7994
1964	0.56514
1965	0.54477
1966	0.58627
1967	0.55566
1968	0.53907
1969	0.54963
1970	0.54328
1971	0.60685
1972	0.63953
1973	0.64203
1974	0.44208
1975	0.18281
1976	-0.15014
1977	-0.39273
1978	-0.46674
1979	-0.23419
1980	0.16498
1981	0.74887
1982	1.24548
1983	1.35458
1984	0.98667
1985	0.27113
1986	-0.63801
1987	-1.33331
1988	-1.25698
1989	-0.10736
1990	1.78412
1991	3.87003
1992	4.8311
1993	5.2446
1994	4.79514
1995	3.77983
1996	2.67005
1997	1.81774
1998	1.25641
1999	1.0955
2000	1.18263
2001	1.41302
2002	1.43456
2003	1.31036
2004	0.95148
2005	0.4913
2006	-0.01782
2007	-0.43543
2008	-0.6984
2009	-0.73055
2010	-0.62393
2011	0.10046
2012	0.55071
2013	0.6695
2014	0.70535
2015	0.6804
2016	0.65593
2017	0.65385