Year	Percent
1960	5.33324
1961	2.41297
1962	1.96202
1963	2.13676
1964	2.19188
1965	1.77547
1966	1.54269
1967	1.75029
1968	1.73912
1969	1.55865
1970	1.12417
1971	1.4006
1972	2.06456
1973	2.12527
1974	2.16047
1975	2.17822
1976	2.16498
1977	2.11228
1978	1.92769
1979	1.65835
1980	1.56922
1981	1.54797
1982	1.55461
1983	1.56633
1984	1.5293
1985	1.42108
1986	1.29311
1987	1.16924
1988	1.01749
1989	0.65936
1990	0.46587
1991	0.4281
1992	0.37842
1993	0.32776
1994	0.28427
1995	0.2073
1996	0.14923
1997	0.13855
1998	0.10717
1999	0.06469
2000	-0.97302
2001	0.0453
2002	-0.00423
2003	-0.2473
2004	-0.24027
2005	-0.22604
2006	-0.24416
2007	-0.23706
2008	-0.17109
2009	-0.11566
2010	-0.46937
2011	-0.13033
2012	-0.20776
2013	-0.26666
2014	-0.28323
2015	-0.2738
2016	-0.20902
2017	-0.10623