Year	Number
2004-01-01	19.9809
2005-01-01	20.8898
2006-01-01	28.0498
2007-01-01	31.2231
2008-01-01	33.4396
2009-01-01	35.6243
2010-01-01	38.2395
2011-01-01	42.0029
2012-01-01	43.9005
2013-01-01	45.0805
2014-01-01	45.9416
2015-01-01	46.8665