Year	Number
2005-01-01	15.7479
2006-01-01	16.4692
2007-01-01	17.3168
2008-01-01	17.3489
2009-01-01	18.3789
2010-01-01	17.1834
2011-01-01	16.7016
2012-01-01	16.7988
2013-01-01	16.6914
2014-01-01	16.5251
2015-01-01	15.9218