Year	Number
2004-01-01	13.1297
2005-01-01	12.0811
2006-01-01	12.0126
2007-01-01	12.3147
2008-01-01	11.6997
2009-01-01	11.0188
2010-01-01	10.9585
2011-01-01	10.7245
2012-01-01	9.9228
2013-01-01	8.9343
2014-01-01	8.5062
2015-01-01	7.7291
2016-01-01	6.1627