Year Percent 1988-01-01 1.69403000000000000 1989-01-01 1.71289000000000020 1990-01-01 1.40371000000000000 1991-01-01 1.34240000000000000 1992-01-01 1.12940000000000000 1993-01-01 1.20023000000000000 1994-01-01 0.14232800000000000 1995-01-01 0.12423100000000000 1996-01-01 0.11550200000000000 1997-01-01 0.11816400000000000 1998-01-01 0.11284400000000000 1999-01-01 0.10703599999999999 2000-01-01 0.11512500000000000 2001-01-01 0.11088699999999999 2002-01-01 0.10686500000000002 2003-01-01 0.08859100000000000 2004-01-01 11.14180000000000000 2005-01-01 11.13040000000000000 2006-01-01 10.52210000000000000 2007-01-01 9.56881000000000100 2008-01-01 8.76268000000000000 2009-01-01 8.43215000000000000 2010-01-01 7.91782000000000000 2011-01-01 6.63797000000000000 2012-01-01 6.63797000000000000 2013-01-01 6.63797000000000000 2014-01-01 1.02309000000000000 2015-01-01 3.41244000000000000 2016-01-01 3.48425000000000000