Year Percent 1996-01-01 35.45450000000000 1997-01-01 46.85310000000000 1998-01-01 46.85310000000000 1999-01-01 226.85900000000000 2000-01-01 83.35080000000000 2001-01-01 83.35080000000000 2002-01-01 83.35080000000000 2003-01-01 83.35080000000000 2004-01-01 88.36890000000000 2005-01-01 85.06700000000001 2006-01-01 102.76100000000001 2007-01-01 73.37740000000000 2008-01-01 69.63780000000000 2009-01-01 59.43740000000000 2010-01-01 65.01000000000000 2011-01-01 54.59980000000000 2012-01-01 35.08410000000000 2013-01-01 21.12060000000000 2014-01-01 29.93810000000000 2015-01-01 31.16230000000000 2016-01-01 25.15490000000000