Year	Percent
1980-01-01	12.862500000000000
1981-01-01	16.661700000000000
1982-01-01	18.279500000000000
1983-01-01	16.551300000000000
1984-01-01	12.312800000000000
1985-01-01	14.947000000000001
1986-01-01	16.732700000000000
1987-01-01	17.282100000000000
1988-01-01	14.791800000000000
1989-01-01	9.061130000000000
1990-01-01	6.546410000000000
1991-01-01	4.907500000000000
1992-01-01	9.990130000000000
1993-01-01	7.380389999999999
1994-01-01	12.088600000000000
1995-01-01	9.286290000000000
1996-01-01	12.357999999999999
1997-01-01	13.026400000000000
1998-01-01	11.193700000000000
1999-01-01	12.971600000000000
2000-01-01	13.618000000000000
2001-01-01	29.763900000000000
2002-01-01	28.416500000000000
2003-01-01	28.462000000000000
2004-01-01	23.105500000000000
2005-01-01	22.671300000000000
2006-01-01	20.455100000000000
2007-01-01	19.028000000000000
2008-01-01	16.712800000000000
2009-01-01	17.283800000000000
2010-01-01	15.918500000000000
2011-01-01	14.930800000000000
2012-01-01	15.927100000000000
2013-01-01	14.275800000000000
2014-01-01	12.043500000000000
2015-01-01	11.959100000000000
2016-01-01	12.534100000000000