Year	Percent
1960	4.29754
1961	4.20731
1962	4.14856
1963	4.16104
1964	4.30996
1965	4.47401
1966	4.74105
1967	4.88899
1968	4.68926
1969	4.02665
1970	3.11901
1971	2.13582
1972	1.34616
1973	1.02138
1974	0.87435
1975	1.51808
1976	2.39634
1977	3.08514
1978	3.59866
1979	3.808
1980	3.80832
1981	3.2631
1982	3.13081
1983	3.04519
1984	2.86816
1985	2.64101
1986	2.35097
1987	2.07518
1988	1.94091
1989	1.97378
1990	2.09653
1991	2.27382
1992	2.35387
1993	2.19839
1994	1.76442
1995	-0.51791
1996	-1.67179
1997	-2.26957
1998	-2.6783
1999	-2.84574
2000	-2.21375
2001	-0.25042
2002	-0.17148
2003	-0.155
2004	-0.22245
2005	-0.3578
2006	-0.51155
2007	-0.60796
2008	-0.5988
2009	-0.52475
2010	-0.36291
2011	-0.10826
2012	0.11692
2013	0.33269
2014	0.49483
2015	0.65456
2016	0.79424
2017	0.93897