Year	Index
2004-01-01	36
2005-01-01	34.3
2006-01-01	34.6
2007-01-01	35.7
2008-01-01	34.1
2009-01-01	34.3
2010-01-01	34.4
2011-01-01	33.2
2012-01-01	32.3
2013-01-01	33.2
2014-01-01	34
2015-01-01	33.2