Year	Percent
1983-01-01	35.453000000000000
1984-01-01	38.990400000000000
1985-01-01	46.845600000000000
1986-01-01	37.758200000000000
1987-01-01	30.038000000000000
1988-01-01	28.120500000000000
1989-01-01	31.044500000000000
1990-01-01	26.077100000000000
1991-01-01	22.276999999999997
1992-01-01	22.021400000000000
1993-01-01	21.517100000000000
1994-01-01	19.804300000000000
1995-01-01	19.050100000000000
1996-01-01	19.905400000000000
1997-01-01	23.696500000000000
1998-01-01	26.731400000000000
1999-01-01	27.868600000000000
2000-01-01	28.681200000000000
2001-01-01	31.882300000000000
2002-01-01	29.603500000000000
2003-01-01	28.275800000000000
2004-01-01	28.371300000000000
2005-01-01	24.155000000000000
2006-01-01	25.061900000000000
2007-01-01	24.963100000000000
2008-01-01	23.328600000000000
2009-01-01	26.657500000000000
2010-01-01	20.906300000000000
2011-01-01	28.084500000000000
2012-01-01	31.527500000000000
2013-01-01	31.457400000000000
2014-01-01	33.350900000000000
2015-01-01	35.458800000000000
2016-01-01	35.180500000000000