Year Percent 1995-01-01 12.6200 1996-01-01 21.7214 1997-01-01 47.5003 1998-01-01 41.0124 1999-01-01 15.6583 2000-01-01 16.9982 2001-01-01 67.6805 2002-01-01 57.1389 2003-01-01 61.3711 2004-01-01 79.4186 2005-01-01 87.3390 2006-01-01 90.1425 2007-01-01 93.4832 2008-01-01 97.0479 2009-01-01 97.4006 2010-01-01 97.1426 2011-01-01 92.9256 2012-01-01 90.5660 2013-01-01 93.2199 2014-01-01 94.7257 2015-01-01 95.4748 2016-01-01 94.3097