Year	Percent
1991-01-01	1.78299999237061
1992-01-01	1.81599998474121
1993-01-01	1.86300003528595
1994-01-01	1.84399998188019
1995-01-01	1.87100005149841
1996-01-01	2.31699991226196
1997-01-01	2.75500011444092
1998-01-01	3.24799990653992
1999-01-01	3.83100008964539
2000-01-01	4.38000011444092
2001-01-01	5.05999994277954
2002-01-01	5.49900007247925
2003-01-01	5.44399976730347
2004-01-01	6.69999980926514
2005-01-01	8.22799968719482
2006-01-01	7.02500009536743
2007-01-01	8.25800037384033
2008-01-01	8.68299961090088
2009-01-01	10.79800033569340
2010-01-01	10.11400032043460
2011-01-01	10.52099990844730
2012-01-01	12.00000000000000
2013-01-01	11.87600040435790
2014-01-01	12.88599967956540
2015-01-01	13.07600021362300
2016-01-01	13.52299976348880
2017-01-01	13.77999973297120