Year	Index
1984-01-01	48.6
1987-01-01	47
1989-01-01	46.2
1992-01-01	47.7
1995-01-01	48.5
1997-01-01	49.1
2004-01-01	46.1
2007-01-01	46.1
2008-01-01	45.5
2011-01-01	43.9
2013-01-01	41.3
2015-01-01	41.0