Year Percent 1984-01-01 0.159350000000000000 1985-01-01 0.147887000000000000 1986-01-01 0.208235000000000000 1987-01-01 0.321905999999999970 1988-01-01 1.118600000000000000 1989-01-01 1.162390000000000000 1990-01-01 1.259300000000000000 1991-01-01 1.011590000000000000 1992-01-01 0.957611000000000100 1993-01-01 0.911317000000000000 1994-01-01 0.647834000000000000 1995-01-01 0.022682000000000000 1996-01-01 0.026686000000000000 1997-01-01 0.028620000000000000 1998-01-01 0.046868000000000000 1999-01-01 0.041253000000000000 2000-01-01 0.038124000000000000 2001-01-01 0.039272000000000000 2002-01-01 0.041481000000000000 2003-01-01 0.037847000000000006 2004-01-01 0.033977999999999994 2005-01-01 0.030341000000000003 2006-01-01 0.122716000000000000 2007-01-01 0.146905000000000000 2008-01-01 0.326504000000000000 2009-01-01 0.644212000000000000 2010-01-01 0.586075000000000000 2011-01-01 1.260660000000000100 2012-01-01 0.574182000000000000 2013-01-01 0.499287000000000000 2014-01-01 0.302323000000000000 2015-01-01 0.646254000000000000 2016-01-01 0.736342000000000000 2017-01-01 0.737738000000000000