Year	Percent
2005	2.69436
2006	2.31281
2007	1.74974
2008	1.88294
2009	1.85179
2010	1.81435
2011	1.74897
2012	1.65646
2013	1.45226
2014	1.47227
2015	1.41525
2016	1.47917
2017	1.6671