Year	Percent
1991-01-01	3.93499994277954
1992-01-01	4.04799985885620
1993-01-01	4.02199983596802
1994-01-01	4.03999996185303
1995-01-01	3.87199997901917
1996-01-01	3.87800002098084
1997-01-01	3.90400004386902
1998-01-01	3.88899993896484
1999-01-01	3.86400008201599
2000-01-01	4.71000003814697
2001-01-01	5.11800003051758
2002-01-01	4.97100019454956
2003-01-01	4.73299980163574
2004-01-01	6.52500009536743
2005-01-01	8.15200042724609
2006-01-01	8.30599975585938
2007-01-01	9.95400047302246
2008-01-01	10.35499954223630
2009-01-01	12.59899997711180
2010-01-01	8.59500026702881
2011-01-01	9.10799980163574
2012-01-01	6.98099994659424
2013-01-01	9.34099960327148
2014-01-01	9.20899963378906
2015-01-01	10.00000000000000
2016-01-01	10.12600040435790
2017-01-01	10.18999958038330