Year	Percent
1991-01-01	12.61400032043460
1992-01-01	13.67300033569340
1993-01-01	13.71899986267090
1994-01-01	12.44799995422360
1995-01-01	18.97100067138670
1996-01-01	15.16100025177000
1997-01-01	14.67300033569340
1998-01-01	12.53400039672850
1999-01-01	12.05599975585940
2000-01-01	10.93299961090090
2001-01-01	11.99499988555910
2002-01-01	12.86200046539310
2003-01-01	11.72900009155270
2004-01-01	12.66100025177000
2005-01-01	11.35999965667720
2006-01-01	8.73999977111816
2007-01-01	7.35500001907349
2008-01-01	7.45300006866455
2009-01-01	9.15100002288818
2010-01-01	9.28600025177002
2011-01-01	8.61400032043457
2012-01-01	8.41899967193604
2013-01-01	9.07900047302246
2014-01-01	7.81599998474121
2015-01-01	9.87600040435791
2016-01-01	11.09899997711180
2017-01-01	10.30200004577640