Year	Index
1992-01-01	30.7
2006-01-01	35.7
2007-01-01	36.1
2008-01-01	33.6
2009-01-01	33.8
2010-01-01	35.7
2011-01-01	34.3
2012-01-01	36
2013-01-01	36.6
2014-01-01	37.4