Year	Number
2004-01-01	15.0078
2005-01-01	13.3556
2006-01-01	12.7808
2007-01-01	12.4402
2008-01-01	12.6927
2009-01-01	12.2406
2010-01-01	12.1156
2011-01-01	12.0574
2012-01-01	12.2886
2013-01-01	12.6363
2014-01-01	12.9133
2015-01-01	12.8861
2016-01-01	12.4150