Year	Number
2004-01-01	2.9795
2005-01-01	2.9997
2006-01-01	5.1860
2007-01-01	13.5771
2008-01-01	13.6093
2009-01-01	17.6156
2010-01-01	18.6181
2011-01-01	20.0193
2012-01-01	20.6595
2013-01-01	21.8312
2014-01-01	23.9048
2015-01-01	24.9074
2016-01-01	25.7006