Year	Percent
1961	-5.42918
1962	-2.3647
1963	-2.11261
1964	-0.03563
1965	-1.72546
1966	-1.50795
1967	-0.32216
1968	-0.58816
1969	-2.87669
1970	1.38058
1971	9.33798
1972	9.17923
1973	32.2404
1974	57.2955
1975	15.74432
1976	16.01555
1977	23.52846
1978	12.42216
1979	29.51238
1980	46.29042
1981	25.58037
1982	3.96365
1983	18.11693
1984	19.87261
1985	3.76463
1986	12.76218
1987	20.54251
1988	19.20983
1989	17.28294
1990	22.53954
1991	25.98906
1992	29.9242
1993	46.17163
1994	33.6776
1995	38.09715
1996	30.27573
1997	16.52646
1998	9.27681
1999	33.20603
2000	24.91446
2001	16.64353
2002	29.2523
2003	13.03725
2004	24.66303
2005	20.16619
2006	14.58259
2007	22.93906
2008	19.42198
2009	4.59852
2010	15.88263
2011	23.74298
2012	24.01611
2013	35.56745
2014	10.83811
2015	0.42924
2016	1.60721
2017	8.09679