Year Percent 1999-01-01 0.08400000000000000 2000-01-01 0.10400000000000001 2001-01-01 0.10500000000000000 2002-01-01 0.13200000000000000 2003-01-01 0.23100000000000000 2004-01-01 0.27500000000000000 2005-01-01 0.08101200000000000 2006-01-01 0.12210599999999999 2007-01-01 0.16025400000000000 2008-01-01 0.15986100000000000 2009-01-01 0.19438800000000000 2010-01-01 0.20944200000000002