Year	Percent
1961	1.04144
1962	3.78056
1963	2.54904
1964	-0.36367
1965	2.05762
1966	1.13667
1967	0.14107
1968	3.27352
1969	3.4542
1970	5.04705
1971	1.57328
1972	5.31723
1973	4.82274
1974	14.92071
1975	14.24694
1976	14.03543
1977	5.17689
1978	12.33446
1979	13.00469
1980	10.18782
1981	7.46895
1982	16.14828
1983	4.74621
1984	1.95358
1985	-4.87698
1986	-3.60417
1987	3.02846
1988	-0.61051
1989	2.22493
1990	2.1766
1991	0.75662
1992	3.02513
1993	2.37832
1994	35.03011
1995	15.09945
1996	6.90729
1997	3.66751
1998	5.2316
1999	8.54326
2000	4.33807
2001	1.97208
2002	3.55311
2003	3.06387
2004	0.7702
2005	4.29381
2006	2.09167
2007	0.39049
2008	6.43807
2009	2.53021
2010	0.88497
2011	3.73388
2012	7.6927
2013	1.40668
2014	-0.24864
2015	0.07575
2016	-0.28
2017	0.3569