Year Percent 1994-01-01 17.5740000000000000 1995-01-01 4.3190000000000000 1996-01-01 5.1248400000000000 1997-01-01 5.8058600000000000 1998-01-01 10.2036000000000000 1999-01-01 6.4886300000000010 2000-01-01 5.9241800000000010 2001-01-01 7.0396600000000005 2002-01-01 7.3877800000000000 2003-01-01 9.1182900000000000 2004-01-01 11.2684000000000000 2005-01-01 13.1648000000000000 2006-01-01 16.0885000000000000 2007-01-01 19.5706000000000000 2008-01-01 22.5978000000000000 2009-01-01 31.2405000000000000 2010-01-01 34.6305000000000000 2011-01-01 29.9188000000000000 2012-01-01 21.8051000000000000 2013-01-01 20.2738000000000000 2014-01-01 21.6351000000000000 2015-01-01 24.7102000000000000 2016-01-01 26.6005000000000000