Year	Percent
1978	5.9756
1979	16.92585
1980	20.56281
1981	8.04773
1982	6.54825
1983	2.84125
1984	3.00253
1985	2.39922
1986	5.15777
1987	6.06465
1988	0.8463
1989	3.87261
1990	5.96174
1991	5.5459
1992	2.37911
1993	0.79244
1994	2.56649
1995	4.96627
1996	0.4385
1997	2.77472
1998	2.49558
1999	2.41829
2000	1.01923
2001	-1.89252
2002	0.26959
2003	5.523
2004	1.0808
2005	6.89287
2006	12.25259
2007	11.53552
2008	-5.00192
2009	-2.64944
2010	11.22606
2011	3.37991
2012	-0.24233
2013	0.29293
2014	4.38568
2015	4.21816
2016	-0.55681
2017	0.02209