Year Percent 2003-01-01 74.6471000000000000 2004-01-01 59.0942000000000000 2005-01-01 25.4725000000000000 2006-01-01 35.3008000000000000 2007-01-01 25.3599000000000000 2008-01-01 18.7660000000000000 2009-01-01 22.4571000000000000 2010-01-01 13.3811000000000000 2011-01-01 7.4073199999999995 2012-01-01 29.3468000000000000 2013-01-01 37.4423000000000000 2014-01-01 21.9846000000000000 2015-01-01 22.0633000000000000 2016-01-01 38.4827000000000000