Year	Number
2004-01-01	0.2679
2007-01-01	0.7672
2008-01-01	0.5856
2010-01-01	1.8520
2011-01-01	2.3086
2012-01-01	2.6330
2013-01-01	8.4122
2014-01-01	7.3493
2015-01-01	7.0530
2016-01-01	6.8350
2017-01-01	7.2923