Year	Percent
2005-01-01	67.5375149970672
2006-01-01	68.3735888545694
2007-01-01	69.4898286111017
2008-01-01	70.3460115853052
2009-01-01	69.1933130897676
2010-01-01	72.0482252294568
2011-01-01	74.2354742196811
2012-01-01	74.5364836700664
2013-01-01	75.1705707055423
2014-01-01	74.8862396144439
2015-01-01	74.9184825108638
2016-01-01	74.8309650131275
2017-01-01	74.8864222475954