Year	Number
2004-01-01	11.6289
2005-01-01	12.1948
2006-01-01	11.8555
2007-01-01	12.4181
2008-01-01	13.0265
2009-01-01	21.1695
2010-01-01	26.3263
2011-01-01	31.5116
2012-01-01	41.7063
2013-01-01	47.6770