Year	Number
2004-01-01	3.214688459
2005-01-01	3.311461360
2006-01-01	3.350349355
2007-01-01	3.393101514
2008-01-01	3.450683791
2009-01-01	3.488268876
2010-01-01	3.524681758
2011-01-01	3.587640967
2012-01-01	3.623354020
2013-01-01	3.435019388
2014-01-01	3.525431655