Year Percent 1995-01-01 76.5225000000000000 1996-01-01 55.7595000000000000 1997-01-01 23.2470000000000000 1998-01-01 10.0716000000000000 1999-01-01 10.5578000000000000 2000-01-01 9.5479399999999990 2001-01-01 11.0917000000000000 2002-01-01 5.7046199999999990 2003-01-01 2.9220900000000003 2004-01-01 6.2004600000000000 2005-01-01 4.6418400000000000 2006-01-01 16.4968000000000000 2007-01-01 16.8583000000000000 2008-01-01 31.5462000000000000 2009-01-01 21.3019000000000000 2010-01-01 23.6267000000000000 2011-01-01 20.4380000000000000 2012-01-01 9.4768300000000000 2013-01-01 6.3344300000000000 2014-01-01 6.8357800000000010 2015-01-01 6.2523400000000000 2016-01-01 6.4885800000000010