Year	Percent
1986	0.19902
1987	-4.39549
1988	10.32071
1989	-9.19968
1990	-3.11946
1991	-9.11233
1992	-30.3194
1993	-17.76199
1994	-22.48771
1995	-13.68983
1996	-17.90799
1997	0.24771
1998	3.7715
1999	2.11954
2000	6.5348
2001	8.2681
2002	8.72819
2003	8.81963
2004	8.06595
2005	4.49981
2006	4.76264
2007	5.51167
2008	5.57743
2009	1.53461
2010	4.14731
2011	5.00466
2012	5.09168
2013	4.99997
2014	4.33967
2015	3.69484
2016	4.62003
2017	4.86238