Year	Index
1988-01-01	25.5261
1989-01-01	13.4767
1990-01-01	13.5585
1991-01-01	21.5843
1992-01-01	17.9275
1993-01-01	18.2648
1994-01-01	17.3904
1995-01-01	17.0878
1996-01-01	13.9125
1997-01-01	15.7950
1998-01-01	23.6825
1999-01-01	29.8223
2000-01-01	22.2664
2001-01-01	24.7792
2002-01-01	28.4451
2003-01-01	29.9103
2004-01-01	18.5260
2005-01-01	11.9973
2006-01-01	11.4253
2007-01-01	14.4227
2008-01-01	23.6833
2009-01-01	36.6955
2010-01-01	29.7622
2011-01-01	27.5598
2012-01-01	28.9207
2013-01-01	26.4055
2014-01-01	18.0371
2015-01-01	19.6849
2016-01-01	25.0929
2017-01-01	21.1821