Year	Number
2004-01-01	0.2409
2005-01-01	0.3286
2006-01-01	0.3811
2007-01-01	0.4598
2008-01-01	1.1821
2009-01-01	1.3713
2010-01-01	1.2751
2011-01-01	1.7570
2012-01-01	2.0895
2013-01-01	1.9923
2014-01-01	1.8629
2015-01-01	1.8080
2016-01-01	1.7343