Year Percent 2000-01-01 6.116164 2001-01-01 6.765752 2002-01-01 5.965005 2003-01-01 6.267058 2004-01-01 4.884512 2005-01-01 3.435776 2006-01-01 2.823930 2007-01-01 2.600816 2008-01-01 2.007437 2009-01-01 1.933416 2010-01-01 1.641578