Year	Index
2004-01-01	30.1
2005-01-01	30.3
2006-01-01	31.1
2007-01-01	31.1
2008-01-01	31.7
2009-01-01	32.1
2010-01-01	31.5
2011-01-01	32.6
2012-01-01	34.3
2013-01-01	37
2014-01-01	35.6
2015-01-01	34