Year	Percent
2005-01-01	37.5504636449448
2006-01-01	37.0155664654463
2007-01-01	37.3697677161345
2008-01-01	37.7834537032069
2009-01-01	39.2023362612223
2010-01-01	38.7864954056486
2011-01-01	39.2740978389458
2012-01-01	39.1741993453642
2013-01-01	40.1980622341259
2014-01-01	41.1211668833931
2015-01-01	42.0635969871297
2016-01-01	42.7723537017386
2017-01-01	43.2675511065737