Year Percent 1998-01-01 48.3000 1999-01-01 45.1000 2000-01-01 32.0000 2001-01-01 80.2000 2002-01-01 62.8000 2003-01-01 96.8000 2004-01-01 124.7000 2005-01-01 109.3000 2006-01-01 74.2000 2007-01-01 67.0000 2008-01-01 53.5000 2009-01-01 33.3000 2010-01-01 32.7651 2011-01-01 28.4927 2012-01-01 31.9786 2013-01-01 34.6281 2014-01-01 36.4645 2015-01-01 38.3629 2016-01-01 44.4919