Year Percent 1993-01-01 10.244100000000000 1994-01-01 12.326900000000000 1995-01-01 15.335200000000000 1996-01-01 16.766400000000000 1997-01-01 19.428200000000000 1998-01-01 21.256700000000000 1999-01-01 19.904000000000000 2000-01-01 18.855700000000000 2001-01-01 20.023100000000000 2002-01-01 21.455100000000000 2003-01-01 22.998300000000000 2004-01-01 23.966900000000000 2005-01-01 25.215200000000000 2006-01-01 27.594800000000000 2007-01-01 32.107000000000000 2008-01-01 36.530400000000000 2009-01-01 46.113100000000000 2010-01-01 41.676100000000000 2011-01-01 42.154600000000000 2012-01-01 44.991000000000010 2013-01-01 49.498100000000000 2014-01-01 53.702600000000000 2015-01-01 61.096000000000004 2016-01-01 61.126600000000000