Year	Percent
1978	1.16568
1979	5.64057
1980	0.11614
1981	1.04258
1982	0.12497
1983	-0.1874
1984	-0.95862
1985	-0.22151
1986	-1.07193
1987	0.66947
1988	0.43892
1989	5.20404
1990	4.45309
1991	1.33233
1992	0.88611
1993	1.46552
1994	1.30245
1995	0.98316
1996	1.2572
1997	1.45172
2000	5.55871
2001	5.16141
2002	7.40643
2003	3.7518
2004	9.59358
2005	8.59541
2006	12.54951
2007	9.77547
2008	7.33007
2009	4.37993
2010	3.90215
2011	4.0162
2012	4.52552
2013	7.60226
2014	2.76197
2015	-0.1865
2016	-0.15855
2017	8.62065