Year Percent 1992-01-01 0.024382000000000000 1993-01-01 0.030257999999999997 1994-01-01 0.032881000000000000 1995-01-01 0.027385000000000003 1996-01-01 0.028290000000000000 1997-01-01 0.027399000000000000 1998-01-01 0.028825000000000000 1999-01-01 0.023890000000000000 2000-01-01 0.026391000000000000 2001-01-01 0.023655000000000002 2002-01-01 0.025370000000000000 2003-01-01 0.022442000000000000 2004-01-01 0.032157000000000000 2005-01-01 0.033363000000000000 2006-01-01 0.034479000000000000 2007-01-01 0.037021000000000000 2008-01-01 0.048842000000000000 2009-01-01 0.058078000000000000 2010-01-01 0.062820000000000000 2011-01-01 0.046347000000000000 2012-01-01 0.044975000000000000 2013-01-01 0.027596000000000000 2014-01-01 0.026279000000000004 2015-01-01 0.034318000000000000 2016-01-01 0.039310000000000005