Year	Number
2004-01-01	27.7497
2005-01-01	18.5207
2006-01-01	17.8506
2007-01-01	11.5381
2008-01-01	12.6780
2009-01-01	13.1446
2010-01-01	13.2362
2011-01-01	19.7290
2012-01-01	17.1924
2013-01-01	16.9031
2014-01-01	17.6949
2015-01-01	17.5486
2016-01-01	16.7073