Year	Percent
2000-01-01	32.9722742688244
2001-01-01	33.6154118349711
2002-01-01	34.4961857137632
2003-01-01	34.4950674682570
2004-01-01	35.1477295305716
2005-01-01	33.9243535629938
2006-01-01	31.0976420596352
2007-01-01	28.7251055769256
2008-01-01	26.0803275840827
2009-01-01	24.9321249709340
2010-01-01	25.1255466138847
2011-01-01	25.6722625692968
2012-01-01	26.4955480518635
2013-01-01	26.3994178632054
2014-01-01	28.4510246481756
2015-01-01	29.8708359588085
2016-01-01	30.1552942029138
2017-01-01	30.2853359286924