Year Percent 1999-01-01 0.200178000000000000 2000-01-01 0.125671000000000000 2001-01-01 0.186621000000000000 2002-01-01 0.199205000000000000 2003-01-01 0.060715000000000000 2004-01-01 0.049789000000000000 2005-01-01 0.045794999999999995 2006-01-01 0.037572000000000000 2007-01-01 0.028995999999999997 2008-01-01 0.021618000000000002 2009-01-01 0.025103999999999998 2010-01-01 0.019953000000000000 2011-01-01 0.015140000000000000 2012-01-01 0.015450000000000000 2013-01-01 0.013119000000000000 2014-01-01 0.012305000000000000 2015-01-01 0.013928000000000000 2016-01-01 0.013848000000000000