Year	Number
2004-01-01	0.6803
2005-01-01	0.7170
2006-01-01	0.9744
2007-01-01	1.8202
2008-01-01	2.4637
2009-01-01	2.6475
2010-01-01	2.8498
2011-01-01	3.0888
2012-01-01	3.1991
2013-01-01	3.3646
2014-01-01	3.7139
2015-01-01	4.1184
2016-01-01	4.5413