Year	Number
2006-01-01	17.8453
2007-01-01	17.2043
2008-01-01	17.1101
2009-01-01	16.5137
2010-01-01	15.9556
2011-01-01	10.7467
2012-01-01	9.4995
2013-01-01	10.0828
2014-01-01	8.9247
2015-01-01	8.6532
2016-01-01	8.0097