Year	Index
1988-01-01	27.3351
1989-01-01	16.7373
1990-01-01	17.4264
1991-01-01	24.4422
1992-01-01	20.7605
1993-01-01	24.3310
1994-01-01	19.2673
1995-01-01	16.2014
1996-01-01	15.0775
1997-01-01	16.5184
1998-01-01	23.6531
1999-01-01	28.7500
2000-01-01	26.6023
2001-01-01	32.8011
2002-01-01	33.0176
2003-01-01	32.4061
2004-01-01	20.8284
2005-01-01	14.7375
2006-01-01	14.9296
2007-01-01	19.2105
2008-01-01	25.5344
2009-01-01	38.8886
2010-01-01	27.7191
2011-01-01	21.0149
2012-01-01	26.5504
2013-01-01	18.4292
2014-01-01	13.1857
2015-01-01	15.8794
2016-01-01	22.1506
2017-01-01	17.2290