Year Percent 2003-01-01 0.028469000000000000 2004-01-01 0.018878000000000000 2005-01-01 0.025813000000000000 2006-01-01 0.024166000000000000 2007-01-01 0.017868000000000002 2008-01-01 0.018769000000000000 2009-01-01 0.038031999999999996 2010-01-01 0.059210000000000006 2011-01-01 0.084561000000000000 2012-01-01 0.081228000000000000