Year	Percent
1961	1.7965
1962	0.4717
1963	3.18117
1964	4.35748
1965	2.13071
1966	1.48826
1967	1.76146
1968	3.4798
1969	1.62899
1970	6.17211
1971	3.05305
1972	3.9489
1973	6.30315
1974	-2.5249
1975	-1.47175
1976	2.93538
1977	2.47678
1978	4.19626
1979	3.64841
1980	-2.14479
1981	-0.80554
1982	2.04713
1983	4.18638
1984	2.1145
1985	3.95912
1986	2.88571
1987	5.08288
1988	5.51306
1989	2.30275
1990	0.43113
1991	-1.39196
1992	0.1029
1993	2.28142
1994	3.61591
1995	2.19901
1996	2.2779
1997	3.77064
1998	2.8377
1999	2.87317
2000	3.2944
2001	2.15012
2002	2.02505
2003	2.8459
2004	1.78371
2005	2.39064
2006	1.70566
2007	1.56279
2008	-1.25278
2009	-4.90974
2010	0.90049
2011	0.66268
2012	0.77816
2013	1.3714
2014	2.28081
2015	1.53555
2016	1.21053
2017	1.12929