Year	Percent
1983-01-01	11.471200000000000
1984-01-01	14.437300000000000
1985-01-01	15.545300000000000
1986-01-01	21.557200000000000
1987-01-01	20.362900000000000
1988-01-01	20.927000000000000
1989-01-01	15.460500000000000
1990-01-01	11.364300000000000
1991-01-01	12.917100000000000
1992-01-01	12.094000000000001
1993-01-01	14.215100000000000
1994-01-01	11.278200000000000
1995-01-01	10.997800000000000
1996-01-01	11.317400000000000
1997-01-01	13.670000000000000
1998-01-01	23.726400000000000
1999-01-01	25.362900000000000
2000-01-01	20.110100000000000
2001-01-01	20.290800000000000
2002-01-01	17.643900000000000
2003-01-01	16.529600000000000
2004-01-01	17.186300000000000
2005-01-01	18.016700000000000
2006-01-01	18.645200000000000
2007-01-01	20.598400000000000
2008-01-01	17.016400000000000
2009-01-01	20.506800000000000
2010-01-01	17.929300000000000
2011-01-01	18.227200000000000
2012-01-01	20.286800000000000
2013-01-01	18.688600000000000
2014-01-01	15.985300000000000
2015-01-01	18.997500000000000
2016-01-01	26.641200000000000