Year	Percent
2005	47.74
2006	47.89
2007	43.73
2008	35.25
2009	41.59
2010	46.26
2011	50.93
2012	51.05
2013	49.42
2014	47.53
2015	43.16
2016	34.94
2017	31.91
2018	29.72
2019	27.53
2020	26.65