Year	Number
2006-01-01	6.7408
2007-01-01	7.1256
2008-01-01	6.8473
2009-01-01	7.2158
2010-01-01	4.8560
2011-01-01	3.9331
2012-01-01	4.3459
2013-01-01	4.2472
2014-01-01	5.2356
2015-01-01	6.1509
2016-01-01	6.0101