Year	Percent
1961	2.9889
1962	-0.82051
1963	-4.80583
1964	0.79151
1965	-1.60985
1966	0.04027
1967	-1.33825
1968	7.94495
1969	3.97639
1970	4.71233
1971	4.22209
1972	4.26353
1973	5.33462
1974	4.91315
1975	2.36027
1976	4.2652
1977	6.13862
1978	4.22913
1979	4.8004
1980	7.31963
1981	5.43342
1982	-0.08787
1983	1.86044
1984	4.65053
1985	0.31581
1986	3.74385
1987	2.8932
1988	3.80272
1989	5.50783
1990	5.34858
1991	5.07092
1992	4.71082
1993	4.75934
1994	5.84006
1995	6.56472
1996	6.22343
1997	3.19688
1998	-14.34678
1999	-0.60856
2000	3.4679
2001	2.21034
2002	3.05741
2003	3.33743
2004	3.58917
2005	4.24826
2006	4.06629
2007	4.90681
2008	4.59061
2009	3.23819
2010	4.82944
2011	4.79425
2012	4.67712
2013	4.23837
2014	3.73124
2015	3.645
2016	3.8453
2017	3.92307