Year	Percent
2006	62.31
2007	58.42
2008	47.53
2009	48.7
2010	57.72
2011	57.87
2012	63.11
2013	59.12
2014	62.66
2015	62.32
2016	54.31
2017	45.81
2018	38.82
2019	33.79
2020	36.64