Year	Percent
1995	7.9001
2000	8.5181
2001	17.8295
2002	23.6173
2003	19.0378
2004	21.4284
2005	17.7836
2006	16.96
2007	16.4402
2008	20.5505
2009	15.9931
2010	18.1605
2011	12.1261
2012	13.006
2013	12.8113
2014	14.6766
2015	14.9341
2016	13.9451
2017	15.0508