Year Percent 1996-01-01 10.9315000000000000 1997-01-01 6.8750100000000005 1998-01-01 4.6164800000000000 1999-01-01 6.5324500000000000 2000-01-01 -12.9445000000000000 2001-01-01 -4.3754500000000000 2002-01-01 0.2050380000000000 2003-01-01 2.3175100000000000 2004-01-01 0.1727250000000000 2005-01-01 5.1896100000000000 2006-01-01 14.2065000000000000 2007-01-01 25.0369000000000000 2008-01-01 25.8777000000000000 2009-01-01 21.8092000000000000 2010-01-01 18.4688000000000000 2011-01-01 19.3010000000000000 2012-01-01 17.2529000000000000 2013-01-01 12.9259999999999980 2014-01-01 16.8708000000000000 2015-01-01 15.4303000000000000 2016-01-01 14.7735000000000000