Year	Percent
2002	37.28996
2003	38.37398
2004	41.76463
2005	39.64861
2006	40.55847
2007	40.90159
2008	45.84505
2009	45.54636
2010	49.13687
2011	50.04786
2012	51.46082
2013	52.96786
2014	53.24554
2015	53.43318
2016	53.01982