Year	Percent
2005-01-01	40.6552287791602
2006-01-01	39.7243796345850
2007-01-01	39.1905679461165
2008-01-01	37.7300890864514
2009-01-01	37.7079631976695
2010-01-01	35.2218171757417
2011-01-01	33.8117498395228
2012-01-01	33.7305378759606
2013-01-01	33.5623919252585
2014-01-01	33.3724008669344
2015-01-01	33.2434472418483
2016-01-01	33.2218603882097
2017-01-01	32.5967982283887