Year	Index
1992-01-01	51.5
1996-01-01	56.9
1999-01-01	58.7
2000-01-01	58.7
2001-01-01	57.2
2002-01-01	55.8
2003-01-01	53.4
2004-01-01	54.8
2005-01-01	53.7
2008-01-01	55.4
2009-01-01	54.5
2010-01-01	54.8
2011-01-01	53.6
2012-01-01	52.9
2013-01-01	52.9
2014-01-01	52.8
2015-01-01	51.1
2016-01-01	50.8