Year Percent 2002-01-01 0.019247000000000000 2003-01-01 0.019457000000000000 2004-01-01 0.019178999999999998 2005-01-01 0.011951000000000000 2006-01-01 0.014050000000000000 2007-01-01 0.011644000000000000 2008-01-01 0.011329000000000000 2009-01-01 0.007151000000000000 2010-01-01 0.005979000000000000 2011-01-01 0.005770000000000000 2012-01-01 0.004594000000000000 2013-01-01 0.004763000000000000 2014-01-01 0.004147000000000000 2015-01-01 0.004468000000000000