Year	Number
2004-01-01	2.5853
2005-01-01	3.2634
2006-01-01	4.3355
2007-01-01	5.3005
2008-01-01	6.3219
2009-01-01	7.5071
2010-01-01	8.4403
2011-01-01	9.0132
2012-01-01	10.0952
2013-01-01	10.7332
2014-01-01	11.8493
2015-01-01	13.4459