Year	Number
2004-01-01	10.8585
2005-01-01	15.3987
2006-01-01	18.9517
2007-01-01	25.6704
2008-01-01	30.2382
2009-01-01	33.3567
2010-01-01	37.9006
2011-01-01	41.1892
2012-01-01	46.1200
2013-01-01	51.1079
2014-01-01	54.6909
2015-01-01	55.4636
2016-01-01	55.2197