Year	Number
2004-01-01	9.4906
2005-01-01	10.9342
2006-01-01	13.1960
2007-01-01	16.1682
2008-01-01	20.8744
2009-01-01	19.8970
2010-01-01	20.4747
2011-01-01	22.8775
2012-01-01	27.2661
2013-01-01	32.3328
2014-01-01	32.2635
2015-01-01	32.1365
2016-01-01	32.6746