Year	Percent
1961	2.65602
1962	4.72213
1963	-2.59342
1964	0.85719
1965	2.24102
1966	-1.02109
1967	7.05836
1968	1.3443
1969	0.28879
1970	-1.59935
1971	-0.33697
1972	0.52366
1973	-1.33439
1974	6.32226
1975	1.08212
1976	6.4678
1977	-1.58873
1978	2.49536
1979	1.47629
1980	-1.43667
1981	1.83268
1982	6.91285
1983	-2.15074
1984	-4.26104
1985	5.75574
1986	5.19496
1987	-2.80246
1988	3.05797
1989	-0.51091
1990	-3.21121
1991	6.189
1992	-2.43052
1993	0.69559
1994	-1.41084
1995	2.85299
1996	7.98735
1997	3.39812
1998	4.34171
1999	4.41532
2000	-1.03264
2001	3.60862
2002	1.39457
2003	4.72271
2004	1.46414
2005	5.49346
2006	3.12417
2007	2.52032
2008	4.09748
2009	-0.1074
2010	2.23944
2011	3.46632
2012	3.30938
2013	2.68496
2014	1.28202
2015	0.88482
2016	2.88081
2017	3.70083