Year	Index
1991-01-01	14.3807
1992-01-01	13.7434
1993-01-01	17.7102
1994-01-01	15.1933
1995-01-01	13.0321
1996-01-01	10.2006
1997-01-01	11.6044
1998-01-01	18.0285
1999-01-01	21.2456
2000-01-01	18.8518
2001-01-01	20.4490
2002-01-01	21.3518
2003-01-01	23.8961
2004-01-01	16.9441
2005-01-01	12.4054
2006-01-01	14.4242
2007-01-01	15.9550
2008-01-01	23.1687
2009-01-01	37.0652
2010-01-01	26.5324
2011-01-01	19.5042
2012-01-01	20.6090
2013-01-01	16.6099
2014-01-01	14.7181
2015-01-01	17.1638
2016-01-01	22.7947
2017-01-01	17.9983