Year	Index
1991-01-01	54
1995-01-01	49.9
1996-01-01	51
1998-01-01	54.5
1999-01-01	52.2
2000-01-01	51.5
2001-01-01	51.4
2002-01-01	51.9
2003-01-01	50.4
2004-01-01	47.8
2005-01-01	48.5
2006-01-01	45.7
2007-01-01	45.2
2008-01-01	46.9
2009-01-01	45.8
2010-01-01	43.5
2011-01-01	42.3
2012-01-01	41.8
2013-01-01	43.4
2014-01-01	41.6
2015-01-01	40.6
2016-01-01	40