Year	Percent
1977	0.00509
1980	0.26502
1981	0.13185
1982	0.16424
1983	0.0813
1984	0.04776
1985	0.18871
1986	0.03683
1987	0.15966
1988	0.04223
1989	0.02114
1990	0.04965
1991	0.05945
1992	0.19065
1993	0.6879
1994	0.47125
1995	0.53832
1996	0.21968
1997	0.16516
1998	0.22159
1999	0.8615
2000	-0.77506
2001	0.55729
2002	0.35891
2003	0.3623
2004	0.52861
2005	0.77045
2006	0.87416
2007	3.59713
2008	1.13094
2009	1.127
2010	1.35886
2011	1.04828
2012	1.66867
2013	1.3416
2014	2.37326
2015	1.89207
2016	0.7861
2017	1.12014