Year	Index
2003-01-01	28.1
2004-01-01	30.5
2005-01-01	29.3
2006-01-01	28.1
2007-01-01	29.2
2008-01-01	28.4
2009-01-01	28.5
2010-01-01	28.4
2011-01-01	28.1
2012-01-01	27.5
2013-01-01	27.7
2014-01-01	28.1
2015-01-01	27.7