Year	Index
1987-01-01	50.5
1994-01-01	53.4
1998-01-01	49.7
1999-01-01	58.6
2000-01-01	56.4
2003-01-01	53.4
2004-01-01	53.9
2005-01-01	53.1
2006-01-01	52.2
2007-01-01	53.3
2008-01-01	49.7
2009-01-01	48.4
2010-01-01	48.7
2011-01-01	45.9
2012-01-01	46.1
2013-01-01	46.9
2014-01-01	45
2015-01-01	46
2016-01-01	45