Year Percent 1996-01-01 5.5380900000000000 1997-01-01 7.0266899999999990 1998-01-01 -17.2838000000000000 1999-01-01 -67.6890000000000000 2000-01-01 -38.7780000000000000 2001-01-01 1.1203299999999998 2002-01-01 5.5032300000000000 2003-01-01 18.8923000000000000 2004-01-01 25.6468000000000000 2005-01-01 17.8696000000000000 2006-01-01 17.0607000000000000 2007-01-01 19.0759000000000000 2008-01-01 23.7934000000000000 2009-01-01 19.7343000000000000 2010-01-01 18.3922000000000000 2011-01-01 19.7282000000000000 2012-01-01 16.6130000000000000 2013-01-01 12.5616000000000000 2014-01-01 20.1843000000000000 2015-01-01 11.1952000000000000 2016-01-01 17.6166000000000000