Year	Index
1984-01-01	19.560
1985-01-01	17.340
1986-01-01	15.570
1987-01-01	17.750
1988-01-01	28.010
1989-01-01	16.070
1990-01-01	16.370
1991-01-01	21.580
1992-01-01	16.940
1993-01-01	18.260
1994-01-01	16.720
1995-01-01	15.400
1996-01-01	13.820
1997-01-01	15.870
1998-01-01	23.440
1999-01-01	27.175
2000-01-01	22.210
2001-01-01	21.800
2002-01-01	21.870
2003-01-01	20.760
2004-01-01	15.885
2005-01-01	13.080
2006-01-01	13.040
2007-01-01	15.140
2008-01-01	23.000
2009-01-01	36.650
2010-01-01	27.880
2011-01-01	21.600
2012-01-01	21.750
2013-01-01	18.090
2014-01-01	14.510
2015-01-01	17.530