Year	Percent
2005	51.71
2006	55.46
2007	48.29
2008	41.5214
2009	44.9327
2010	47.5474
2011	57.2203
2012	56.9955
2013	57.4695
2014	49.9881
2015	48.6873
2016	39.5282
2017	36.3311