Year Percent 1996-01-01 0.6829260000000000 1997-01-01 0.7004480000000000 1998-01-01 0.6885030000000000 1999-01-01 0.6451450000000000 2000-01-01 3.1769200000000000 2001-01-01 3.2766800000000000 2002-01-01 1.1778899999999999 2003-01-01 1.3395600000000000 2004-01-01 1.5192000000000000 2005-01-01 2.2407300000000000 2006-01-01 2.2377900000000000 2007-01-01 1.7817300000000000 2008-01-01 5.3948400000000000 2009-01-01 6.0578300000000000 2010-01-01 5.2937500000000000 2011-01-01 5.3315500000000000 2012-01-01 5.3311900000000000 2013-01-01 5.3033100000000000 2014-01-01 4.9243600000000000 2015-01-01 4.9180900000000000 2016-01-01 4.4468300000000000 2017-01-01 4.1802100000000000