Year Percent 1982-01-01 1.18247000000000010 1983-01-01 0.82228200000000000 1984-01-01 0.73407700000000010 1985-01-01 0.73051599999999990 1986-01-01 0.97885100000000000 1987-01-01 0.59233500000000010 1988-01-01 0.21857200000000000 1989-01-01 0.15805300000000000 1990-01-01 0.26131600000000000 1991-01-01 0.46158699999999997 1992-01-01 0.73396000000000010 1993-01-01 0.97300900000000000 1994-01-01 7.14803000000000000 1995-01-01 7.11298000000000000 1996-01-01 8.16085000000000000 1997-01-01 8.95338000000000100 1998-01-01 8.68993000000000000 1999-01-01 12.74710000000000000 2000-01-01 12.93740000000000000 2001-01-01 14.18790000000000000 2002-01-01 16.37510000000000000 2003-01-01 18.44370000000000000 2004-01-01 15.39650000000000000 2005-01-01 11.92010000000000000 2006-01-01 9.95656000000000100 2007-01-01 8.46695000000000000 2008-01-01 6.88383999999999900 2009-01-01 8.35681999999999900 2010-01-01 7.73045000000000000 2011-01-01 7.73452000000000000 2012-01-01 10.39570000000000000 2013-01-01 11.58860000000000000 2014-01-01 12.73060000000000000 2015-01-01 15.57810000000000000 2016-01-01 15.79790000000000000