Year	Index
1988-01-01	28.0102
1989-01-01	18.1426
1990-01-01	16.3747
1991-01-01	21.8398
1992-01-01	18.6304
1993-01-01	18.6620
1994-01-01	17.0097
1995-01-01	17.7411
1996-01-01	16.0473
1997-01-01	16.1827
1998-01-01	22.5799
1999-01-01	25.6831
2000-01-01	21.9706
2001-01-01	23.2821
2002-01-01	28.2422
2003-01-01	35.0553
2004-01-01	21.5510
2005-01-01	12.7866
2006-01-01	12.8759
2007-01-01	15.1395
2008-01-01	23.5249
2009-01-01	37.9382
2010-01-01	27.7942
2011-01-01	23.4619
2012-01-01	27.3617
2013-01-01	20.7805
2014-01-01	15.3998
2015-01-01	18.4302
2016-01-01	23.6347
2017-01-01	17.4031