Year Percent 1995-01-01 2.624310000000000 1996-01-01 5.483100000000000 1997-01-01 12.933200000000000 1998-01-01 14.483200000000000 1999-01-01 8.031900000000000 2000-01-01 8.288739999999999 2001-01-01 11.083800000000000 2002-01-01 10.348600000000000 2003-01-01 11.390500000000000 2004-01-01 10.462800000000000 2005-01-01 10.641900000000000 2006-01-01 12.795000000000000 2007-01-01 13.977500000000000 2008-01-01 16.022600000000000 2009-01-01 28.187600000000000 2010-01-01 29.793900000000000 2011-01-01 28.897600000000000 2012-01-01 31.099700000000000 2013-01-01 31.830200000000000 2014-01-01 35.573800000000000 2015-01-01 40.770300000000000 2016-01-01 38.182400000000000