Year	Number
2004-01-01	2.7970
2005-01-01	6.6714
2006-01-01	10.0942
2007-01-01	20.6342
2008-01-01	23.7675
2009-01-01	14.7013
2010-01-01	17.3503
2011-01-01	20.3933
2012-01-01	24.5201
2013-01-01	32.8475