Year	Percent
1990	0.54983
1991	0.28724
1992	0.29247
1993	0.18969
1994	-0.25386
1995	-0.3464
1996	-0.40066
1997	-0.22123
1998	-0.46934
1999	-0.35598
2000	0.36843
2001	-0.38991
2002	0.70794
2003	0.54444
2004	1.07782
2005	2.19292
2006	3.75533
2007	6.945
2008	4.71802
2009	2.17521
2010	2.38587
2012	1.74049
2013	1.07171
2014	0.12153
2015	2.47881
2016	1.52697