Year	Number
2004-01-01	0.9307
2005-01-01	1.3213
2006-01-01	1.7035
2007-01-01	2.0608
2008-01-01	2.4098
2009-01-01	2.6010
2010-01-01	2.7007
2011-01-01	3.1411
2012-01-01	3.8391
2013-01-01	4.9194
2014-01-01	5.5676
2015-01-01	6.4733
2016-01-01	6.4733
2017-01-01	6.4733