Year	Index
1987-01-01	56.2
1990-01-01	57.2
1992-01-01	54.8
1994-01-01	56.4
1996-01-01	54.9
1998-01-01	55.5
2000-01-01	52.8
2003-01-01	51.5
2006-01-01	48.2
2009-01-01	49
2011-01-01	47.6
2013-01-01	47.3
2015-01-01	47.7