Year	Number
2004-01-01	2.4306
2005-01-01	3.4962
2006-01-01	4.6386
2007-01-01	8.0160
2008-01-01	8.9098
2009-01-01	16.3800
2010-01-01	15.5541
2011-01-01	16.7814
2012-01-01	28.5872
2013-01-01	10.4548
2014-01-01	13.0130
2015-01-01	20.4812
2016-01-01	24.7060