Year	Percent
1989-01-01	19.166500000000000
1990-01-01	19.225300000000000
1991-01-01	18.574400000000000
1992-01-01	15.325300000000000
1993-01-01	16.963000000000000
1994-01-01	17.053200000000000
1995-01-01	18.746700000000000
1996-01-01	20.035999999999998
1997-01-01	23.766800000000000
1998-01-01	27.000000000000000
1999-01-01	31.052400000000000
2000-01-01	30.682500000000000
2001-01-01	30.231800000000000
2002-01-01	29.172700000000000
2003-01-01	31.725200000000000
2004-01-01	31.897100000000000
2005-01-01	31.997400000000000
2006-01-01	32.153000000000000
2007-01-01	33.057900000000000
2008-01-01	24.011999999999997
2009-01-01	29.480700000000000
2010-01-01	28.018800000000000
2011-01-01	26.291900000000000
2012-01-01	29.419800000000000
2013-01-01	30.246100000000000
2014-01-01	31.088100000000000
2015-01-01	31.315200000000000
2016-01-01	33.646600000000000