Year	Number
2004-01-01	9.1817
2005-01-01	9.5709
2006-01-01	10.0327
2007-01-01	10.6385
2008-01-01	11.3831
2009-01-01	11.7917
2010-01-01	12.1588
2011-01-01	12.7140
2012-01-01	13.4042
2013-01-01	14.2448
2014-01-01	15.0322
2015-01-01	15.9921
2016-01-01	16.9015