Year Percent 2000-01-01 0.0010000000000000 2001-01-01 0.0020000000000000 2002-01-01 0.1570000000000000 2003-01-01 0.8079999999999999 2004-01-01 1.7700000000000000 2005-01-01 2.6500000000000000 2006-01-01 4.6700000000000000 2007-01-01 5.5600000000000000 2008-01-01 5.5800000000000000 2009-01-01 8.2800000000000000 2010-01-01 9.0100000000000000 2011-01-01 8.3800000000000000 2012-01-01 9.8300000000000000 2013-01-01 10.8900000000000000 2014-01-01 12.8600000000000000 2015-01-01 14.5600000000000000 2016-01-01 16.4400000000000000