Year Percent 1995-01-01 1.8800100000000000 1996-01-01 2.0525400000000000 1997-01-01 21.5495000000000000 1998-01-01 10.8611000000000000 1999-01-01 10.3913000000000000 2000-01-01 5.7988900000000000 2001-01-01 5.8381500000000000 2002-01-01 4.7233300000000010 2003-01-01 5.2155400000000000 2004-01-01 4.7381100000000000 2005-01-01 5.1828699999999990 2006-01-01 4.8820000000000000 2007-01-01 5.8623300000000000 2008-01-01 5.2942000000000000 2009-01-01 7.3609100000000005 2010-01-01 8.8441900000000000 2011-01-01 7.1234500000000000 2012-01-01 6.6828100000000010 2013-01-01 7.0199899999999990