Year	Number
2004-01-01	56.1727
2005-01-01	56.7238
2006-01-01	57.9572
2007-01-01	59.1225
2008-01-01	62.5647
2009-01-01	59.6557
2010-01-01	58.3965
2011-01-01	57.9570
2012-01-01	56.4296
2013-01-01	53.2591
2014-01-01	50.7858
2015-01-01	49.5589
2016-01-01	48.6573