Year Percent 2003-01-01 1.260000 2004-01-01 1.210000 2005-01-01 0.017613 2006-01-01 5.590000 2007-01-01 5.690000 2008-01-01 6.080000 2009-01-01 7.970000 2010-01-01 8.460000 2011-01-01 8.410000 2012-01-01 8.780000 2013-01-01 9.300000 2014-01-01 8.680000 2015-01-01 8.890000 2016-01-01 9.800000