Year	Index
1980-01-01	40.8
1986-01-01	42.8
1987-01-01	45.3
1991-01-01	46.8
1992-01-01	45.5
1993-01-01	44.9
1994-01-01	45.9
1995-01-01	48.9
1996-01-01	49.5
1997-01-01	49.1
1998-01-01	50.7
1999-01-01	49.8
2000-01-01	51.1
2001-01-01	53.3
2002-01-01	53.8
2003-01-01	50.7
2004-01-01	48.3
2005-01-01	47.7
2006-01-01	46.6
2007-01-01	46.3
2008-01-01	44.5
2009-01-01	43.9
2010-01-01	43
2011-01-01	42.3
2012-01-01	41.2
2013-01-01	41
2014-01-01	41.4
2016-01-01	42.4