Year	Index
1993-01-01	26.7
1996-01-01	32.7
1998-01-01	32.3
1999-01-01	32.6
2000-01-01	33
2001-01-01	32.8
2002-01-01	34.1
2003-01-01	34.9
2004-01-01	35.4
2005-01-01	34.5
2006-01-01	33.7
2007-01-01	33.5
2008-01-01	33.7
2009-01-01	33.6
2010-01-01	33.2
2011-01-01	32.8
2012-01-01	32.4
2013-01-01	32.5
2014-01-01	32.1
2015-01-01	31.8