Year	Index
1985-01-01	41
1988-01-01	40.7
1991-01-01	43.8
1994-01-01	42.9
1997-01-01	46
2000-01-01	42.8
2003-01-01	41.5
2006-01-01	42.9
2009-01-01	41.8
2012-01-01	42.2
2015-01-01	40.1