Year	Number
2004-01-01	1.3711
2005-01-01	1.7866
2006-01-01	2.0359
2007-01-01	2.2187
2008-01-01	2.5096
2009-01-01	2.5428
2010-01-01	2.1772
2011-01-01	2.3434
2012-01-01	2.3600
2013-01-01	2.5262
2014-01-01	2.6425
2015-01-01	2.8752
2016-01-01	4.0053
2017-01-01	4.1133