Year	Number
2004-01-01	6.5164
2005-01-01	6.8249
2006-01-01	6.8605
2007-01-01	7.0004
2008-01-01	7.0965
2009-01-01	7.4079
2010-01-01	9.7439
2011-01-01	9.8477
2012-01-01	9.9748
2013-01-01	11.5613
2014-01-01	12.9858
2015-01-01	15.4658
2016-01-01	18.8670