Year	Percent
1991-01-01	23.05599975585940
1992-01-01	22.62800025939940
1993-01-01	24.83600044250490
1994-01-01	22.79400062561040
1995-01-01	18.70800018310550
1996-01-01	17.94799995422360
1997-01-01	15.74199962615970
1998-01-01	11.34099960327150
1999-01-01	8.49400043487549
2000-01-01	6.48699998855591
2001-01-01	6.11199998855591
2002-01-01	7.75899982452393
2003-01-01	8.10200023651123
2004-01-01	8.27299976348877
2005-01-01	8.56400012969971
2006-01-01	8.58699989318848
2007-01-01	9.13000011444092
2008-01-01	13.47200012207030
2009-01-01	24.32699966430660
2010-01-01	27.72500038146970
2011-01-01	29.08200073242190
2012-01-01	30.40600013732910
2013-01-01	26.71899986267090
2014-01-01	23.78800010681150
2015-01-01	20.72999954223630
2016-01-01	17.06900024414060
2017-01-01	13.61400032043460