Year Percent 1995-01-01 12.45780 1996-01-01 11.99502 1997-01-01 11.77850 1998-01-01 10.80799 1999-01-01 11.15347 2000-01-01 11.94342 2001-01-01 15.71168 2002-01-01 17.36190 2003-01-01 21.92455 2004-01-01 24.10128 2005-01-01 23.62602 2006-01-01 30.44525 2007-01-01 28.04963 2008-01-01 21.62875 2009-01-01 21.33208