Year Percent 1979-01-01 0.031658000000000000 1980-01-01 0.020246000000000000 1981-01-01 0.033156000000000000 1982-01-01 0.037166000000000005 1983-01-01 0.012324000000000000 1984-01-01 0.106521000000000000 1985-01-01 0.093242999999999990 1986-01-01 0.010476000000000001 1987-01-01 0.013793999999999999 1988-01-01 0.115433000000000000 1989-01-01 0.114247000000000000 1990-01-01 0.101882000000000000 1991-01-01 0.093989000000000000 1992-01-01 0.113815000000000010 1993-01-01 0.169285000000000000 1994-01-01 0.288361000000000030 1995-01-01 0.266191000000000000 1996-01-01 0.396540000000000000 1997-01-01 0.377287000000000000 1998-01-01 0.394334000000000000 1999-01-01 0.397702000000000000 2000-01-01 0.650143000000000000 2001-01-01 0.863779999999999900 2002-01-01 0.705768000000000100 2003-01-01 0.852943000000000000 2004-01-01 0.927461000000000100 2005-01-01 0.924226000000000000 2006-01-01 0.515703000000000000 2007-01-01 0.474027999999999950 2008-01-01 0.442056000000000060 2009-01-01 0.440590000000000000 2010-01-01 0.422232000000000000 2011-01-01 5.395090000000000000 2012-01-01 5.139510000000000000 2013-01-01 3.899150000000000000 2014-01-01 5.136880000000001000 2015-01-01 13.344000000000001000 2016-01-01 6.961880000000001000 2017-01-01 7.471810000000000500