Year Percent 1995-01-01 10.474900000000000 1996-01-01 10.221700000000000 1997-01-01 10.866200000000000 1998-01-01 13.448600000000000 1999-01-01 11.899500000000000 2000-01-01 12.764600000000000 2001-01-01 15.789000000000001 2002-01-01 18.209500000000000 2003-01-01 21.452100000000000 2004-01-01 22.864900000000000 2005-01-01 22.084000000000000 2006-01-01 29.216200000000000 2007-01-01 31.968900000000000 2008-01-01 28.099400000000000 2009-01-01 30.262600000000000 2010-01-01 29.562600000000000 2011-01-01 31.114200000000000 2012-01-01 30.578300000000000 2013-01-01 31.383700000000000 2014-01-01 32.279500000000000 2015-01-01 34.396400000000000 2016-01-01 32.577500000000000