Year	Percent
1980-01-01	10.204100000000000
1981-01-01	10.003000000000000
1982-01-01	9.822260000000000
1983-01-01	5.054209999999999
1984-01-01	11.911100000000000
1985-01-01	10.369800000000000
1986-01-01	9.216439999999999
1987-01-01	9.800160000000000
1988-01-01	8.533640000000000
1989-01-01	8.946980000000000
1990-01-01	8.720620000000000
1991-01-01	8.945820000000000
1992-01-01	9.470880000000001
1993-01-01	12.142300000000000
1994-01-01	12.382300000000000
1995-01-01	12.511100000000000
1996-01-01	12.901200000000000
1997-01-01	12.611200000000000
1998-01-01	12.089500000000000
1999-01-01	12.283800000000000
2000-01-01	12.896100000000000
2001-01-01	12.094300000000000
2002-01-01	13.158100000000000
2003-01-01	12.416500000000000
2004-01-01	11.992200000000000
2005-01-01	10.833100000000000
2006-01-01	10.403300000000000
2007-01-01	9.763520000000000
2008-01-01	12.886900000000000
2009-01-01	12.792000000000000
2010-01-01	12.651100000000000
2011-01-01	13.333400000000000
2012-01-01	14.624300000000000
2013-01-01	4.119740000000000
2014-01-01	4.516700000000000
2015-01-01	4.221670000000000
2016-01-01	4.171060000000000