Year	Number
2004-01-01	25.4444
2005-01-01	27.5750
2006-01-01	31.0891
2007-01-01	35.9850
2008-01-01	43.1320
2009-01-01	48.6857
2010-01-01	50.8871
2011-01-01	53.8689
2012-01-01	56.2673
2013-01-01	58.3502
2014-01-01	63.4606
2015-01-01	68.4851
2016-01-01	72.4280