Year	Number
2004-01-01	7.3859
2005-01-01	8.1647
2006-01-01	9.3620
2007-01-01	10.4053
2008-01-01	12.0956
2009-01-01	13.2173
2010-01-01	12.3893
2011-01-01	15.9072
2012-01-01	35.1469
2013-01-01	42.0276
2014-01-01	50.0549
2015-01-01	54.8066
2016-01-01	57.0881