Year	Percent
1989-01-01	12.403100000000000
1990-01-01	12.584900000000000
1991-01-01	14.950700000000000
1992-01-01	15.819500000000000
1993-01-01	15.640999999999998
1994-01-01	14.822300000000000
1995-01-01	14.900500000000000
1996-01-01	15.080800000000000
1997-01-01	12.859600000000000
1998-01-01	20.322800000000000
1999-01-01	24.525300000000000
2000-01-01	25.784400000000000
2001-01-01	32.664500000000000
2002-01-01	36.320300000000000
2003-01-01	38.101500000000000
2004-01-01	38.677000000000000
2005-01-01	36.481200000000000
2006-01-01	37.583900000000000
2007-01-01	37.028700000000000
2008-01-01	37.346500000000000
2009-01-01	45.840600000000000
2010-01-01	42.878500000000000
2011-01-01	37.884400000000000
2012-01-01	39.670800000000000
2013-01-01	32.366200000000000
2014-01-01	24.107200000000000
2015-01-01	25.214900000000000
2016-01-01	25.522300000000000