Year	Percent
2000	21.259
2001	22.31432
2002	21.59535
2003	19.32949
2004	18.97294
2005	17.34154
2006	17.68265
2007	17.00299
2008	17.69479
2009	17.34876
2010	17.1484
2011	15.09422
2012	14.89051
2013	15.45724
2014	14.30366
2015	14.35346
2016	15.82871
2017	17.41512