Year Percent 1996-01-01 0.6300040000000000 1997-01-01 0.7735350000000001 1998-01-01 1.0571400000000000 1999-01-01 1.3333500000000000 2000-01-01 1.4629500000000000 2001-01-01 1.7748700000000002 2002-01-01 1.8781299999999999 2003-01-01 1.8716000000000000 2004-01-01 1.7470700000000001 2005-01-01 1.7717100000000000 2006-01-01 1.5033600000000000 2007-01-01 1.5535600000000000 2008-01-01 1.5186899999999999 2009-01-01 1.3598200000000000 2010-01-01 1.2064600000000000 2011-01-01 1.0765799999999999 2012-01-01 1.0868700000000000 2013-01-01 1.2051399999999999 2014-01-01 1.5681900000000000 2015-01-01 3.3194800000000004