Year	Number
2004-01-01	35.5941
2005-01-01	38.8946
2006-01-01	42.4725
2007-01-01	43.4563
2008-01-01	44.0906
2009-01-01	46.2524
2010-01-01	48.4464
2011-01-01	50.9451
2012-01-01	53.1659
2013-01-01	56.9597
2014-01-01	57.5314
2015-01-01	58.9690
2016-01-01	61.0802
2017-01-01	64.6030