Year	Index
1985-01-01	45.5
1986-01-01	38
1987-01-01	40.5
1988-01-01	36.9
1992-01-01	39.4
1995-01-01	40.6
1998-01-01	39
2002-01-01	41.3
2008-01-01	43.2
2015-01-01	41.5