Year	Percent
1985	5.32212
1986	2.17154
1987	5.37078
1988	4.43719
1989	7.47887
1990	9.04936
1991	6.89046
1992	3.75553
1993	2.18796
1994	2.53778
1995	2.93888
1996	2.55449
1997	2.66169
1998	2.37877
1999	2.30007
2000	3.26705
2001	1.16733
2002	2.94503
2003	2.64997
2004	5.96285
2005	3.16209
2006	3.27691
2007	45.49895
2008	1.55045
2009	8.78998
2010	-0.57768
2011	-4.54905
2012	-0.0142
2013	1.53785
2014	-0.52801
2015	1.94815