Year	Index
1993-01-01	48.4
1996-01-01	46.1
1997-01-01	38.4
1998-01-01	38.1
1999-01-01	37.4
2000-01-01	37.1
2001-01-01	36.9
2002-01-01	37.3
2003-01-01	40
2004-01-01	40.3
2005-01-01	41.3
2006-01-01	41
2007-01-01	42.3
2008-01-01	41.6
2009-01-01	39.8
2010-01-01	39.5
2011-01-01	39.7
2012-01-01	40.7
2013-01-01	40.9
2014-01-01	39.9
2015-01-01	37.7