Year	Percent
1981	6.61244
1982	0.85939
1983	7.32469
1984	1.76092
1985	6.68627
1986	1.22838
1987	2.79689
1988	4.46062
1989	3.95946
1990	-1.28083
1991	-0.92888
1992	8.10898
1993	5.78479
1994	15.99464
1995	11.28507
1996	8.65314
1997	8.5589
1998	10.05083
1999	8.88436
2000	11.97489
2001	0.2417
2002	3.29769
2003	2.35579
2004	8.42582
2005	5.35732
2006	6.58498
2007	13.83463
2008	5.50425
2009	-2.31143
2010	0.37191
2011	2.80594
2012	-0.08077
2013	-0.38469
2014	-0.59875
2015	-0.22058
2016	2.53851
2017	2.59305