Year Percent 1996-01-01 0.9787280000000000 1997-01-01 1.0507500000000000 1998-01-01 1.3026100000000000 1999-01-01 2.7771000000000000 2000-01-01 3.2135599999999998 2001-01-01 0.9692950000000000 2002-01-01 0.7244890000000000 2003-01-01 0.5793670000000000 2004-01-01 0.6153220000000000 2005-01-01 1.3049100000000000 2006-01-01 1.1687600000000000 2007-01-01 1.0824799999999999 2008-01-01 1.5973400000000000 2009-01-01 1.9806300000000000 2010-01-01 2.1261799999999997 2011-01-01 1.9234799999999999 2012-01-01 1.6531099999999999 2013-01-01 2.2689000000000000 2014-01-01 2.8453900000000000 2015-01-01 2.7891300000000000 2016-01-01 2.3275400000000000