Year	Percent
1989-01-01	5.877080000000000
1990-01-01	4.978269999999999
1991-01-01	4.680400000000000
1992-01-01	5.025790000000000
1993-01-01	5.691710000000000
1994-01-01	11.051300000000000
1995-01-01	21.819200000000000
1996-01-01	19.563200000000000
1997-01-01	13.420700000000000
1998-01-01	9.942350000000000
1999-01-01	10.234000000000000
2000-01-01	11.851900000000000
2001-01-01	11.075700000000000
2002-01-01	9.455739999999999
2003-01-01	8.713750000000000
2004-01-01	8.228860000000001
2005-01-01	8.157240000000000
2006-01-01	10.170700000000000
2007-01-01	12.465500000000000
2008-01-01	13.257100000000000
2009-01-01	17.177600000000000
2010-01-01	22.005900000000000
2011-01-01	22.350600000000000
2012-01-01	19.540200000000000
2013-01-01	18.546100000000000
2014-01-01	17.778100000000000
2015-01-01	18.986300000000000
2016-01-01	19.565000000000000
2017-01-01	20.321200000000000