Year Percent 2001-01-01 1.5625300000000000 2002-01-01 1.6718099999999998 2003-01-01 1.9378000000000000 2004-01-01 1.7641900000000001 2005-01-01 2.7638100000000000 2006-01-01 1.8725800000000000 2007-01-01 2.3216799999999997 2008-01-01 1.8610000000000000 2009-01-01 1.6109799999999999 2010-01-01 2.0318600000000000 2011-01-01 1.4850500000000000 2012-01-01 0.9802160000000000 2013-01-01 2.3000500000000000 2014-01-01 1.2035600000000000 2015-01-01 1.5650000000000000 2016-01-01 2.7348600000000000