Year	Percent
1991	4.20778
1992	3.81967
1993	5.85685
1994	2.65077
1995	10.34956
1996	7.04876
1997	8.78576
1998	6.85456
1999	6.72696
2000	5.80781
2001	7.54129
2002	5.38038
2003	4.87257
2004	4.36076
2005	7.52452
2006	16.20078
2007	50.50475
2008	47.47706
2009	-2.27204
2010	-15.98922
2011	7.46273
2012	8.30531
2013	-2.78971
2014	9.19677
2015	-4.00314
2016	55.48993
2017	-8.91136