Year	Percent
1981	0.12109
1982	0.13857
1983	0.16417
1984	0.17109
1985	0.06993
1986	-0.00362
1987	0.00348
1988	0.01397
1989	-0.01753
1990	0.13552
1991	0.04804
1992	0.04118
1993	0.05883
1994	-0.05154
1995	-0.5018
1996	-0.41494
1997	-5.37626
1998	-10.80176
1999	-24.94459
2000	-8.07341
2001	-7.3974
2002	-4.2327
2003	-2.91367
2004	2.18259
2005	4.72171
2006	0.00219
2007	-0.53914
2008	-0.77375
2009	-0.93337
2010	4.93267
2011	0.69203
2012	1.61168
2013	9.10419
2014	8.81178
2015	6.42116
2016	15.27967
2017	0.04968