Year	Percent
1996	13.18382
1997	15.61605
1998	17.84835
1999	13.20768
2000	8.13637
2001	13.74928
2002	3.73368
2003	3.47358
2004	11.98068
2005	13.15453
2006	11.68272
2007	2.3268
2008	16.0232
2009	9.11251
2010	4.74515
2011	15.79691
2012	2.47983
2013	7.81488
2014	14.81855
2015	11.19752