Year Percent 1975-01-01 0.09262000000000001 1976-01-01 0.08047400000000000 1977-01-01 0.05680399999999999 1978-01-01 0.10345399999999999 1979-01-01 0.36538300000000000 1980-01-01 0.78636200000000000 1981-01-01 0.49550100000000000 1982-01-01 0.30897600000000003 1983-01-01 0.15505000000000000 1984-01-01 0.13151900000000000 1985-01-01 0.11582900000000000 1986-01-01 0.23109800000000000 1987-01-01 0.73643200000000000 1988-01-01 0.97150700000000000 1989-01-01 0.48701500000000000 1990-01-01 1.34446000000000000 1991-01-01 0.81315700000000000 1992-01-01 3.42354000000000000 1993-01-01 0.18145600000000000 1994-01-01 0.37204100000000000 1995-01-01 0.38494900000000000 1996-01-01 0.30259300000000000 1997-01-01 0.19211800000000000 1998-01-01 0.16050899999999999 1999-01-01 0.16050899999999999 2000-01-01 0.16050899999999999 2001-01-01 0.16050899999999999 2002-01-01 0.16050899999999999 2003-01-01 0.16050899999999999 2004-01-01 0.16050899999999999 2005-01-01 0.16050899999999999 2006-01-01 0.16050899999999999 2007-01-01 0.16050899999999999 2008-01-01 0.16050899999999999 2009-01-01 0.16050899999999999 2010-01-01 0.16050899999999999 2011-01-01 0.16050899999999999 2012-01-01 0.16050899999999999 2013-01-01 0.16050899999999999 2014-01-01 0.16050899999999999 2015-01-01 0.16050899999999999 2016-01-01 0.16050899999999999 2017-01-01 1.53582000000000000