Year	Number
2004-01-01	1.4754
2005-01-01	2.7694
2006-01-01	4.3545
2007-01-01	13.0677
2008-01-01	11.8898
2009-01-01	17.2821
2010-01-01	18.3911
2012-01-01	37.6733
2013-01-01	37.4412
2014-01-01	37.2882
2015-01-01	32.9882
2016-01-01	24.4350