Year	Number
2004-01-01	6.8923
2005-01-01	7.2516
2006-01-01	7.2891
2007-01-01	7.6716
2008-01-01	7.5615
2010-01-01	10.4205
2011-01-01	12.6436
2012-01-01	12.4369
2013-01-01	12.1084
2015-01-01	11.7461