Year	Percent
1995	11.4297
2000	12.3194
2001	25.0141
2002	31.519
2003	24.1042
2004	25.5399
2005	21.001
2006	22.0145
2007	19.0073
2008	23.6319
2009	20.4029
2010	19.016
2011	15.1713
2012	15.9251
2013	15.1098
2014	18.6484
2015	17.7343
2016	17.795
2017	17.5226