Year Percent 1994-01-01 29.8143000000000000 1995-01-01 22.5709000000000000 1996-01-01 16.1959000000000000 1997-01-01 23.2290000000000000 1998-01-01 25.0771000000000000 1999-01-01 18.9619000000000000 2000-01-01 15.3969000000000000 2001-01-01 14.1202000000000000 2002-01-01 13.5872000000000000 2003-01-01 12.2258000000000000 2004-01-01 10.2153000000000000 2005-01-01 8.9389200000000000 2006-01-01 8.3671899999999990 2007-01-01 7.8473800000000000 2008-01-01 7.5851399999999990 2009-01-01 7.3185400000000000 2010-01-01 6.1249300000000000 2011-01-01 5.3282700000000000 2012-01-01 5.2462100000000000 2013-01-01 5.1361300000000005 2014-01-01 5.1162300000000010 2015-01-01 5.2951700000000000 2016-01-01 4.4858100000000000