Year	Index
1979-01-01	36.3
1986-01-01	36.5
1992-01-01	35.5
1997-01-01	38.1
2001-01-01	38.9
2005-01-01	41.7
2007-01-01	41
2010-01-01	42.6
2012-01-01	41.4