Year	Index
1971-01-01	18.2971
1972-01-01	28.1451
1973-01-01	49.9408
1974-01-01	57.0021
1975-01-01	48.0428
1976-01-01	31.4404
1977-01-01	18.7507
1978-01-01	15.2050
1979-01-01	25.2659
1980-01-01	25.9546
1981-01-01	31.9989
1982-01-01	33.9657
1983-01-01	36.9889
1984-01-01	33.2061
1985-01-01	28.2966
1986-01-01	20.1268
1987-01-01	23.2562
1988-01-01	44.2420
1989-01-01	32.9787
1990-01-01	30.5265
1991-01-01	19.4477
1992-01-01	18.3454
1993-01-01	22.5843
1994-01-01	28.7367
1995-01-01	26.8353
1996-01-01	18.9076
1997-01-01	20.6323
1998-01-01	43.5846
1999-01-01	40.3317
2000-01-01	30.3071
2001-01-01	29.2290
2002-01-01	25.8402
2003-01-01	19.7354
2004-01-01	17.6505
2005-01-01	14.7901
2006-01-01	12.8279
2007-01-01	17.3678
2008-01-01	34.1620
2009-01-01	47.0892
2010-01-01	30.9747
2011-01-01	19.6351
2012-01-01	23.9149
2013-01-01	17.9663
2014-01-01	15.2204
2015-01-01	16.2348
2016-01-01	21.4622
2017-01-01	15.9698