Year Percent 1995-01-01 19.2423000000000000 1996-01-01 21.0432000000000000 1997-01-01 18.3791000000000000 1998-01-01 18.4905000000000000 1999-01-01 21.2717000000000000 2000-01-01 15.8817000000000000 2001-01-01 13.4967000000000000 2002-01-01 13.4803000000000000 2003-01-01 10.4744000000000000 2004-01-01 7.6509199999999990 2005-01-01 5.9336100000000000 2006-01-01 16.7422000000000000 2007-01-01 12.6831000000000000 2008-01-01 9.0804600000000000 2009-01-01 9.5801199999999990 2010-01-01 9.3953400000000000 2011-01-01 3.1266800000000000 2012-01-01 7.4122800000000000 2013-01-01 3.5020500000000000 2014-01-01 3.9171300000000002 2015-01-01 5.4550199999999990 2016-01-01 3.3385300000000004