Year	Number
2004-01-01	2.0008
2005-01-01	2.2835
2006-01-01	3.0667
2007-01-01	2.8449
2008-01-01	3.1409
2009-01-01	3.5536
2010-01-01	5.4952
2011-01-01	6.0530
2012-01-01	11.0116
2013-01-01	11.2990
2014-01-01	12.5256
2015-01-01	14.4619