Year	Percent
1995	21.44
2001	26.5399
2002	23.6044
2003	14.1306
2004	20.9283
2005	20.5381
2006	18.0942
2007	20.0655
2008	15.1224
2009	18.1712
2010	19.3119
2011	17.4633
2012	18.5993
2013	17.0762
2014	19.437
2015	21.1311
2016	17.572
2017	18.6113