Year Percent 2005-01-01 7.05227206475000 2006-01-01 7.12429622225000 2007-01-01 7.36699981950000 2008-01-01 7.91854605841667 2009-01-01 10.34396592000000 2010-01-01 9.92338727000000 2011-01-01 9.95946331683334 2012-01-01 9.51097180716667 2013-01-01 9.47202520816667 2014-01-01 9.48225139941667 2015-01-01 8.66637684950000 2016-01-01 7.69794496266667 2017-01-01 6.86514779000000