Year	Number
2004-01-01	2.0008
2005-01-01	2.2835
2006-01-01	2.3280
2007-01-01	2.0832
2008-01-01	2.1570
2009-01-01	2.2640
2010-01-01	4.2601
2011-01-01	4.7163
2012-01-01	9.7001
2013-01-01	10.5843
2014-01-01	11.1588
2015-01-01	13.8556