Year	Index
1992-01-01	29.7
1993-01-01	28.9
1995-01-01	39.3
1996-01-01	35.2
2002-01-01	29
2003-01-01	28.7
2004-01-01	28.9
2005-01-01	29
2006-01-01	29.8
2007-01-01	27
2008-01-01	26.6
2009-01-01	25.3
2010-01-01	24.8
2011-01-01	24.6
2012-01-01	24.7
2013-01-01	24.6
2014-01-01	24
2015-01-01	25.5
2016-01-01	25