Year	Percent
2002	6.98468
2003	10.82873
2004	11.97546
2005	8.69561
2006	14.35476
2007	20.4713
2008	36.73992
2009	17.85729
2010	23.0567
2011	29.98596
2012	1.34234
2013	-5.44708
2014	-4.50875
2015	-6.39895
2016	7.9165
2017	-6.30533