Year	Index
2003-01-01	29.5
2004-01-01	29.8
2005-01-01	28.7
2006-01-01	29.6
2007-01-01	30.6
2008-01-01	30.4
2009-01-01	31.5
2010-01-01	30.3
2011-01-01	30.8
2012-01-01	30.5
2013-01-01	30.8
2014-01-01	30.5
2015-01-01	30.5