Year	Percent
1961	2.46858
1962	2.53925
1963	1.48656
1964	1.99535
1965	0.45282
1966	0.41622
1967	1.333
1968	-0.54237
1969	6.86678
1970	2.04286
1971	3.00181
1972	4.10364
1973	7.6844
1974	16.7612
1975	11.62914
1976	3.78921
1977	8.16395
1978	6.77263
1979	9.70658
1980	11.52872
1981	10.99834
1982	9.76733
1983	9.27421
1984	7.79124
1985	8.99147
1986	5.73763
1987	-1.59048
1988	-1.40268
1989	1.51732
1990	-0.01787
1991	-0.7242
1992	-0.92928
1993	-0.12964
1994	33.89108
1995	7.36789
1996	4.31661
1997	2.05069
1998	2.75598
1999	0.34169
2000	1.94782
2001	2.61385
2002	3.29982
2003	0.51254
2004	0.53022
2005	2.48311
2006	3.992
2007	5.31795
2008	6.90107
2009	-1.73169
2010	1.84931
2011	4.11773
2012	2.48762
2013	-2.31983
2014	-1.03482
2015	0.31434
2016	1.11351
2017	2.50662