Year	Percent
1991-01-01	4.84700012207031
1992-01-01	4.83300018310547
1993-01-01	4.88100004196167
1994-01-01	4.76599979400635
1995-01-01	4.77400016784668
1996-01-01	5.04899978637695
1997-01-01	5.25500011444092
1998-01-01	5.63999986648560
1999-01-01	5.84499979019165
2000-01-01	5.97100019454956
2001-01-01	6.53200006484985
2002-01-01	6.88999986648560
2003-01-01	7.13999986648560
2004-01-01	7.53800010681152
2005-01-01	8.10000038146973
2006-01-01	8.48600006103516
2007-01-01	9.00199985504150
2008-01-01	12.30900001525880
2009-01-01	11.51299953460690
2010-01-01	10.51099967956540
2011-01-01	9.33300018310547
2012-01-01	8.42700004577637
2013-01-01	7.52500009536743
2014-01-01	6.73600006103516
2015-01-01	5.87300014495850
2016-01-01	4.90000009536743
2017-01-01	4.92899990081787