Year	Percent
1991	11.99358
1992	13.17175
1993	16.37591
1994	20.78436
1995	45.74334
1996	36.77009
1997	13.29049
1998	-8.34295
1999	33.46091
2000	23.34605
2001	2.7482
2002	8.71188
2003	10.89234
2004	14.11332
2005	18.53335
2006	13.58865
2007	10.88828
2008	20.37775
2009	-8.70527
2010	23.61629
2011	18.11367
2012	5.89318
2013	9.20907
2014	7.1632
2015	27.3528
2016	4.45312