Year	Number
2004-01-01	22.5410
2005-01-01	22.4043
2006-01-01	19.0718
2007-01-01	18.9060
2008-01-01	29.6440
2009-01-01	29.3677
2010-01-01	27.5926
2011-01-01	27.4474
2012-01-01	27.3091
2013-01-01	27.1583
2014-01-01	26.9744
2015-01-01	28.2293