Year	Percent
1962	1.40572
1963	0.14349
1964	1.48872
1965	0.12969
1966	2.5335
1967	3.91012
1968	3.31993
1969	5.27097
1970	1.59443
1971	-0.77589
1972	-2.35928
1973	5.03928
1974	1.92382
1975	4.17289
1976	1.43507
1977	3.18274
1978	3.76295
1979	4.56718
1980	4.1055
1981	4.05566
1982	2.60231
1983	3.31919
1984	3.61919
1985	3.51736
1986	2.87462
1987	0.28824
1988	1.05085
1989	0.93303
1990	5.05539
1991	3.3481
1992	3.21712
1993	5.77947
1994	4.60934
1995	4.63992
1996	3.09374
1997	5.80425
1998	4.16736
1999	3.75079
2000	5.36322
2001	-2.22795
2002	3.16693
2003	5.08015
2004	4.58925
2005	5.41454
2006	6.87136
2007	6.03867
2008	5.23275
2009	2.87227
2010	7.35676
2011	7.7822
2012	8.55687
2013	2.59206
2014	4.02081
2015	4.03103
2016	3.30111
2017	1.95372