Year	Index
2004-01-01	29.8
2005-01-01	29
2006-01-01	30
2007-01-01	29.6
2008-01-01	29.3
2009-01-01	27.9
2010-01-01	27.8
2011-01-01	27.7
2012-01-01	27.6
2013-01-01	28.1
2014-01-01	28.6
2015-01-01	28.2