Year	Number
2004-01-01	0.3918
2005-01-01	0.7635
2006-01-01	0.7244
2007-01-01	1.0680
2008-01-01	4.5735
2009-01-01	4.9061
2010-01-01	4.9100
2011-01-01	5.4677
2012-01-01	5.6329
2013-01-01	5.9625
2014-01-01	5.8334
2015-01-01	6.1006
2016-01-01	6.1598
2017-01-01	6.2443