Year	Number
2004-01-01	7.4556
2005-01-01	7.9799
2006-01-01	8.1268
2007-01-01	7.9217
2008-01-01	7.7264
2009-01-01	7.5393
2010-01-01	4.4782
2011-01-01	4.0582
2012-01-01	3.9565
2013-01-01	3.5586
2014-01-01	4.0452
2015-01-01	3.9422
2016-01-01	4.1158