Year	Percent
1983-01-01	62.623300000000000
1984-01-01	50.640000000000000
1985-01-01	49.863400000000000
1986-01-01	54.557600000000000
1987-01-01	44.540700000000000
1988-01-01	50.399300000000000
1989-01-01	54.231100000000000
1990-01-01	59.855900000000000
1991-01-01	33.427000000000000
1992-01-01	30.761400000000000
1993-01-01	20.490400000000000
1994-01-01	19.166300000000000
1995-01-01	23.222700000000000
1996-01-01	26.307000000000000
1997-01-01	22.514700000000000
1998-01-01	20.620400000000000
1999-01-01	35.260000000000000
2000-01-01	35.088600000000000
2001-01-01	35.203800000000000
2002-01-01	27.054300000000000
2003-01-01	29.946400000000000
2004-01-01	35.979300000000000
2005-01-01	26.817200000000000
2006-01-01	28.151400000000000
2007-01-01	27.358500000000000
2008-01-01	17.374000000000002
2009-01-01	15.962300000000000
2010-01-01	15.752400000000000
2011-01-01	14.552500000000000
2012-01-01	14.167800000000000
2013-01-01	14.504800000000000
2014-01-01	15.242300000000000
2015-01-01	13.208100000000000
2016-01-01	13.238600000000000