Year	Percent
1977	-0.56085
1978	0.99651
1979	3.24751
1980	0.67043
1981	0.8321
1982	1.22326
1983	0.67849
1984	0.80732
1985	0.34591
1986	0.72714
1987	0.99074
1988	-0.30259
1989	0.10416
1990	0.04844
1991	-0.35386
1992	-0.75618
1993	-0.78044
1994	0.42321
1995	0.55591
1996	1.08411
1997	0.15968
1998	0.75471
1999	0.59801
2000	0.09722
2001	0.55631
2002	0.56933
2003	0.99144
2004	1.1889
2005	0.75522
2006	2.37375
2007	3.34302
2008	5.89903
2009	2.13349
2010	3.09766
2011	1.68102
2012	3.22786
2013	0.12201
2014	0.20406
2015	0.18942
2016	0.42262
2017	0.88126