Year	Number
2004-01-01	23.2848
2005-01-01	23.8877
2006-01-01	24.5530
2007-01-01	24.3451
2008-01-01	26.1746
2009-01-01	25.0364
2010-01-01	24.9527
2011-01-01	24.7047
2012-01-01	25.3909
2013-01-01	25.6821
2014-01-01	26.7438
2015-01-01	27.0141
2016-01-01	27.0349
2017-01-01	25.7663