Year	Index
2007-01-01	20.8425000000000000
2008-01-01	10.9501000000000000
2009-01-01	8.3686300000000000
2010-01-01	7.4548000000000000
2011-01-01	7.3323899999999990
2012-01-01	5.1418700000000000
2013-01-01	3.6333900000000003
2014-01-01	3.6738800000000005
2015-01-01	3.6072100000000000
2016-01-01	3.9549199999999995
2017-01-01	3.3784199999999998