Year	Percent
2004	25.35007
2005	27.1
2006	28.9
2007	30.8
2008	32.9
2009	35.1
2010	37.5
2011	35.61154
2012	56.83878
2013	60.31
2014	61
2015	68.11958
2016	69.88165
2017	71.27233