Year Percent 2002-01-01 0.636655000000000000 2003-01-01 0.582557000000000000 2004-01-01 0.503841000000000000 2005-01-01 0.439540999999999960 2006-01-01 0.375026000000000000 2007-01-01 0.296535000000000000 2008-01-01 0.246679000000000000 2009-01-01 0.225288000000000020 2010-01-01 0.166598000000000000 2011-01-01 0.131552000000000000 2012-01-01 0.109005999999999990 2013-01-01 0.094388000000000000 2014-01-01 0.066605000000000000 2015-01-01 0.087139000000000000 2016-01-01 0.060887000000000004 2017-01-01 0.057274000000000000