Year	Index
1989-01-01	23.3
1992-01-01	25.5
1994-01-01	28.2
2006-01-01	39.6
2007-01-01	37.5
2008-01-01	36.4
2009-01-01	35.6
2010-01-01	35.5
2011-01-01	35.9
2012-01-01	36.5
2013-01-01	36.9
2014-01-01	36.0
2015-01-01	35.9