Year	Percent
1996	9.66454
1997	9.34427
1998	11.97796
1999	12.33684
2000	16.06693
2001	14.03756
2002	19.15674
2003	18.97823
2004	12.92453
2005	8.43751
2006	7.77732
2007	6.87841
2008	6.47485
2009	9.22873
2010	9.06634
2011	7.97209
2012	8.37538
2013	10.00599
2014	11.45167
2015	13.76032
2016	10.71925