Year	Percent
1961	-3.65861
1962	3.89467
1963	3.14595
1964	5.83432
1965	2.79744
1966	3.933
1967	0.43097
1968	5.01665
1969	5.29301
1970	16.94328
1971	-0.81419
1972	5.78881
1973	12.20225
1974	16.98071
1975	-0.8553
1976	12.21568
1977	1.17221
1978	5.12998
1979	6.35443
1980	7.92136
1981	7.18201
1982	10.81138
1983	6.81869
1984	4.40749
1985	3.09248
1986	-0.08377
1987	0.06303
1988	2.77644
1989	4.02098
1990	2.51339
1991	1.82284
1992	3.72908
1993	5.97277
1994	3.54237
1995	2.33207
1996	4.48787
1997	-0.95985
1998	-2.00367
1999	5.80074
2000	2.16498
2001	0.457
2002	1.68081
2003	2.68282
2004	2.95494
2005	4.1957
2006	7.03552
2007	1.49014
2008	3.88372
2009	1.39802
2010	3.61672
2011	4.77359
2012	2.5565
2013	1.69592
2014	1.64584
2015	1.31907
2016	-1.30939
2017	2.12966