Year Percent 2000-01-01 42.8035 2001-01-01 44.4600 2002-01-01 42.5800 2003-01-01 46.0900 2004-01-01 50.3500 2005-01-01 55.9200 2006-01-01 26.4600 2007-01-01 26.1800 2008-01-01 24.4200 2009-01-01 27.9500 2010-01-01 29.2200 2011-01-01 32.9600 2012-01-01 32.8500 2013-01-01 33.0600 2014-01-01 35.6100 2015-01-01 36.0800 2016-01-01 37.5800