Year	Number
2004-01-01	2.8678
2005-01-01	3.2589
2006-01-01	4.2720
2007-01-01	3.8880
2008-01-01	4.1561
2009-01-01	4.6156
2010-01-01	6.4173
2011-01-01	7.0195
2012-01-01	11.8395
2013-01-01	12.2265
2014-01-01	13.8301
2015-01-01	15.1070