Year	Number
2004-01-01	18.2216
2005-01-01	42.1812
2006-01-01	38.7087
2007-01-01	40.2351
2008-01-01	41.6246
2009-01-01	54.5221
2010-01-01	52.4545
2011-01-01	55.6454
2012-01-01	58.4130
2013-01-01	59.9548
2014-01-01	61.9097
2015-01-01	64.8612
2016-01-01	65.6830