Year Percent 1996-01-01 9.0909100000000010 1997-01-01 9.5238100000000010 1998-01-01 13.6364000000000000 1999-01-01 22.8571000000000000 2000-01-01 27.4725000000000000 2001-01-01 12.0172000000000000 2002-01-01 4.0609100000000000 2003-01-01 14.2180000000000000 2004-01-01 15.1899000000000000 2005-01-01 20.6642000000000000 2006-01-01 21.8750000000000000 2007-01-01 20.3327000000000000 2008-01-01 14.7563000000000000 2009-01-01 9.6408300000000010 2010-01-01 2.1259500000000000 2011-01-01 0.5521610000000000 2012-01-01 0.5521610000000000 2013-01-01 -1.2096799999999999 2014-01-01 2.9268300000000000 2015-01-01 -1.9146100000000000