Year	Percent
1976	0.55663
1977	0.63366
1978	0.74681
1979	-0.28756
1980	0.16452
1981	-0.16641
1982	-0.02942
1983	0.80083
1984	0.33755
1985	0.32628
1986	0.63987
1987	0.46285
1988	0.40478
1989	0.32844
1990	0.0394
1991	0.47941
1992	0.26335
1993	0.24598
1994	0.02839
1995	0.42633
1996	-0.05004
1997	0.57763
1998	10.09185
1999	1.91241
2000	1.47137
2001	2.2707
2002	3.71125
2003	1.06615
2004	2.64681
2005	3.47762
2006	1.50707
2007	9.11435
2008	5.0206
2009	2.09486
2010	-0.61341
2011	0.60393
2012	2.01124
2013	1.1156
2014	2.24165
2015	2.13477
2016	2.00512
2017	1.33405