Year	Number
2004-01-01	38.7176
2005-01-01	41.4349
2006-01-01	44.7491
2007-01-01	50.3420
2008-01-01	54.2822
2009-01-01	55.7251
2010-01-01	56.6949
2011-01-01	57.7027
2012-01-01	56.4884
2013-01-01	57.1275
2014-01-01	57.8381
2015-01-01	57.2457
2016-01-01	59.4033