Year	Number
2004-01-01	0.7607
2005-01-01	1.1010
2006-01-01	1.3363
2007-01-01	1.6065
2008-01-01	2.0269
2009-01-01	2.6825
2010-01-01	2.9872
2011-01-01	3.3064
2012-01-01	3.7303
2013-01-01	4.4534
2014-01-01	4.2440
2015-01-01	4.5980
2016-01-01	4.6978