Year	Number
2004-01-01	4.8951
2005-01-01	6.3323
2006-01-01	6.1155
2007-01-01	10.3839
2008-01-01	19.4977
2009-01-01	23.9243
2010-01-01	28.0766
2011-01-01	28.7024
2012-01-01	34.3540
2013-01-01	35.8394
2014-01-01	34.8298
2015-01-01	39.8945