Year	Percent
1989	0.61263
1990	3.69235
1991	-1.23953
1992	-2.75205
1993	-2.13034
1994	-1.64465
1995	0.49943
1996	1.66343
1997	0.83746
1998	1.10603
1999	2.20248
2000	2.21896
2001	3.17055
2002	4.23581
2003	3.88994
2004	4.73025
2005	4.99335
2006	1.51229
2007	5.13563
2008	2.28708
2009	2.09847
2010	3.05497
2011	4.57042
2012	1.90735
2013	3.97761
2014	3.69775
2015	3.69917
2016	3.71875
2017	3.85953