Year	Percent
2003	0.92403
2004	0.92619
2006	0.93542
2007	0.92409
2008	0.90633
2009	0.92123
2010	0.88459
2011	0.89291
2012	0.91258
2014	0.87104
2015	0.85031
2016	0.84751