Year	Percent
1961	5.06283
1962	1.53458
1963	5.64206
1964	8.23125
1965	5.6657
1966	5.98288
1967	3.27929
1968	2.03146
1969	2.06734
1970	3.85955
1971	8.99175
1972	5.55368
1973	6.71359
1974	3.73569
1975	8.2207
1976	8.44953
1977	8.61802
1978	9.89978
1979	8.18976
1980	8.7349
1981	8.05476
1982	9.22078
1983	0.01213
1984	24.06635
1985	-5.11319
1986	-16.93283
1987	-3.13308
1988	9.36193
1989	-1.25261
1990	8.01233
1991	3.0735
1992	-12.90655
1993	-1.3146
1994	43.54496
1995	8.83313
1996	11.45845
1997	3.78279
1998	6.74941
1999	-7.57287
2000	5.2898
2001	13.79765
2002	1.90782
2003	0.079
2004	9.73426
2005	28.11193
2006	9.98443
2007	3.30193
2008	8.64882
2009	-9.55875
2010	6.3912
2011	8.5804
2012	1.09725
2013	-4.14137
2014	0.64579
2015	-8.14721
2016	-8.36752
2017	7.26499