Year Percent 1989-01-01 0.06896900000000000 1990-01-01 0.10986900000000001 1991-01-01 0.11683699999999998 1992-01-01 0.05262700000000000 1993-01-01 0.04686000000000000 1994-01-01 0.08555600000000000 1995-01-01 0.12677400000000000 1996-01-01 0.13572000000000000 1997-01-01 0.17702100000000000 1998-01-01 0.15307100000000000 1999-01-01 0.38191300000000000 2000-01-01 0.46731900000000000 2001-01-01 0.18691400000000000 2002-01-01 0.10683100000000000 2003-01-01 0.14974700000000000 2004-01-01 0.23209200000000002 2005-01-01 0.25230000000000000 2006-01-01 0.40217200000000000 2007-01-01 0.69879499999999990 2008-01-01 0.97883999999999990 2009-01-01 1.06401000000000010 2010-01-01 0.91320800000000000 2011-01-01 0.70820300000000000 2012-01-01 0.51735200000000000 2013-01-01 0.87714400000000000 2014-01-01 1.12101000000000000 2015-01-01 1.34654000000000000