Year Percent 2002-01-01 0.43200000000000005 2003-01-01 0.75000000000000000 2004-01-01 0.59700000000000000 2005-01-01 1.47000000000000000 2006-01-01 1.77000000000000000 2007-01-01 1.67000000000000000 2008-01-01 1.29000000000000000 2009-01-01 1.76000000000000000 2010-01-01 1.80000000000000000 2011-01-01 1.98000000000000000 2012-01-01 2.27000000000000000 2013-01-01 2.81000000000000000 2014-01-01 2.75000000000000000 2015-01-01 3.47000000000000000 2016-01-01 3.98000000000000000