Year	Percent
1978	8.63731
1979	2.26383
1980	-3.46912
1981	4.80305
1982	0.79994
1983	3.5828
1984	5.65619
1985	6.58013
1986	12.22426
1987	2.22709
1988	11.45755
1989	7.19054
1990	8.14591
1991	-0.83664
1992	6.43606
1993	-0.53968
1994	0.58222
1995	0.44763
1996	1.59
1997	-1.9027
1998	4.84471
1999	1.40295
2000	-1.09238
2001	-4.24037
2002	-0.47617
2003	3.54154
2004	6.40431
2005	-1.25288
2006	5.13506
2007	-0.1501
2008	4.44806
2009	0.11392
2010	-2.51028
2011	-0.09432
2012	-0.39327
2013	2.90901
2014	-0.64591
2015	1.51192
2016	1.19164
2017	2.21431