Year	Percent
2001	40.70535
2002	43.56831
2003	46.37697
2004	53.05488
2005	51.96769
2006	50.84287
2007	64.41406
2008	69.64566
2009	73.80863
2010	63.57104
2011	62.01646
2012	64.8207
2013	64.90964
2014	68.93519
2015	74.35083
2016	75.74463
2017	72.42669