Year	Number
2004-01-01	39.1490
2005-01-01	40.0113
2006-01-01	42.3310
2007-01-01	41.4421
2008-01-01	40.6648
2009-01-01	40.2849
2010-01-01	39.1817
2011-01-01	38.2336
2012-01-01	38.0225
2013-01-01	37.7250
2014-01-01	37.3803
2015-01-01	36.9925
2016-01-01	36.1416