Year Percent 1993-01-01 0.9208430000000001 1994-01-01 0.9555739999999999 1995-01-01 0.9629310000000000 1996-01-01 1.0255299999999998 1997-01-01 1.0611100000000000 1998-01-01 1.0970100000000000 1999-01-01 1.1655200000000001 2000-01-01 1.2997000000000000 2001-01-01 1.5360000000000000 2002-01-01 1.9795000000000000 2003-01-01 1.9643900000000000 2004-01-01 2.0558099999999997 2005-01-01 2.2433400000000003 2006-01-01 2.4652600000000000 2007-01-01 3.1296000000000000 2008-01-01 3.5763599999999998 2009-01-01 3.4237599999999997 2010-01-01 3.4101100000000000 2011-01-01 3.3383400000000000 2012-01-01 2.8847600000000000 2013-01-01 2.5477600000000000 2014-01-01 2.5167900000000003 2015-01-01 2.4167600000000000 2016-01-01 2.5131799999999997