Year Percent 1995-01-01 0.24564299999999997 1996-01-01 0.19684300000000002 1997-01-01 0.16989600000000000 1998-01-01 0.45066800000000000 1999-01-01 0.40691600000000000 2000-01-01 0.38626400000000000 2001-01-01 0.38958400000000004 2002-01-01 0.27330700000000000 2003-01-01 0.25152300000000000 2004-01-01 0.22301800000000000 2005-01-01 0.56955300000000000 2006-01-01 1.82002000000000000 2007-01-01 2.46719000000000000 2008-01-01 2.06225000000000000 2009-01-01 2.65585000000000000 2010-01-01 3.56276000000000000 2011-01-01 4.28088000000000100 2012-01-01 6.47213000000000000 2013-01-01 8.34921000000000100 2014-01-01 10.28160000000000000 2015-01-01 11.63500000000000000 2016-01-01 11.10960000000000000