Year	Percent
1987	2.76845
1988	4.19925
1989	4.7275
1990	4.94965
1991	5.10137
1992	3.03057
1993	3.01222
1994	2.61503
1995	2.42499
1996	1.69753
1997	0.64659
1998	3.11268
1999	-0.90938
2000	1.08204
2001	1.15915
2002	0.0213
2003	-0.39328
2004	1.05163
2005	2.08713
2006	1.42096
2007	3.28019
2008	4.78757
2009	5.26525
2010	3.79511
2011	1.3222
2012	7.16471
2013	0.79595
2014	2.83702
2015	-5.54476
2016	4.73583
2017	-0.01961