Year Percent 2000-01-01 20.391800000000000 2001-01-01 24.209800000000000 2002-01-01 16.316000000000000 2003-01-01 21.678800000000000 2004-01-01 28.571200000000000 2005-01-01 65.217600000000000 2006-01-01 39.161300000000000 2007-01-01 38.174500000000000 2008-01-01 19.956900000000000 2009-01-01 13.978100000000000 2010-01-01 12.855200000000000 2011-01-01 11.420400000000000 2012-01-01 10.549300000000000 2013-01-01 11.899800000000000 2014-01-01 12.159400000000000 2015-01-01 11.597999999999999 2016-01-01 11.632100000000000