Year	Percent
1989-01-01	29.343800000000000
1990-01-01	27.661200000000000
1991-01-01	26.382200000000000
1992-01-01	25.066999999999997
1993-01-01	26.593900000000000
1994-01-01	27.569000000000003
1995-01-01	27.157500000000000
1996-01-01	24.235100000000000
1997-01-01	25.776999999999997
1998-01-01	26.260900000000000
1999-01-01	23.706800000000000
2000-01-01	23.861700000000000
2001-01-01	22.455300000000000
2002-01-01	25.279100000000000
2003-01-01	24.043300000000000
2004-01-01	24.020000000000000
2005-01-01	20.296800000000000
2006-01-01	20.160000000000000
2007-01-01	18.747900000000000
2008-01-01	17.727600000000000
2009-01-01	17.859200000000000
2010-01-01	18.627400000000000
2011-01-01	15.873800000000000
2012-01-01	16.872000000000000
2013-01-01	16.676100000000000
2014-01-01	14.461400000000000
2015-01-01	14.223300000000000
2016-01-01	13.481400000000000