Year	Index
1999-01-01	10.1543000000000000
2000-01-01	6.0374900000000000
2001-01-01	4.9034400000000000
2002-01-01	6.8971800000000005
2003-01-01	8.8402200000000000
2004-01-01	8.5328100000000010
2005-01-01	6.3560200000000000
2006-01-01	7.7436399999999990
2007-01-01	28.5525000000000000
2008-01-01	22.8755000000000000
2009-01-01	23.2037000000000000
2010-01-01	15.8646000000000000
2011-01-01	8.2458800000000000
2012-01-01	7.5479100000000010
2013-01-01	4.6605800000000000
2014-01-01	4.4280599999999990
2015-01-01	4.0216300000000000
2016-01-01	4.6482000000000000
2017-01-01	4.6998500000000000