Year	Number
2004-01-01	3.163107518
2005-01-01	3.300123314
2006-01-01	3.378418055
2007-01-01	3.458670164
2008-01-01	3.552623852
2009-01-01	3.625046488
2010-01-01	3.695511754
2011-01-01	3.793380180
2012-01-01	3.861888078
2013-01-01	3.687682280
2014-01-01	3.812953865