Year	Number
2004-01-01	3.9745
2005-01-01	4.1447
2006-01-01	5.6337
2007-01-01	6.4582
2008-01-01	10.3567
2009-01-01	12.0561
2010-01-01	10.8824
2011-01-01	11.7492
2012-01-01	13.6633
2013-01-01	14.7722
2014-01-01	15.6566
2015-01-01	15.3707