Year	Percent
1961	5.90875
1962	-2.64349
1963	10.02554
1964	13.05833
1965	-6.78247
1966	7.46425
1967	0.79847
1968	8.4059
1969	5.31945
1970	5.86048
1971	4.7234
1972	-0.44976
1973	1.06699
1974	-0.49454
1975	3.28429
1976	7.78886
1977	2.49051
1978	5.98111
1979	-2.10135
1980	-14.81623
1981	-0.92407
1982	-4.01368
1983	-7.85578
1984	-6.596
1985	0.44793
1986	-0.60752
1987	-3.96061
1988	-2.44543
1989	-0.66048
1990	-4.55062
1991	-3.44007
1992	-3.67769
1993	-3.56058
1994	-2.4878
1995	3.75738
1996	4.4646
1997	0.71616
1998	2.03359
1999	-0.97388
2000	-4.33572
2001	-1.95619
2002	-3.51558
2003	-3.10499
2004	-0.55903
2005	-0.15695
2006	-0.45554
2007	-0.29579
2008	0.37583
2009	0.98106
2010	-0.30744
2011	-6.64761
2012	8.00176
2013	6.17437
2014	6.06575
2015	6.12457
2016	5.6562
2017	5.13996