Year	Number
2004-01-01	1.7480
2005-01-01	7.6247
2006-01-01	11.8389
2007-01-01	10.9813
2008-01-01	11.5539
2009-01-01	8.3558
2010-01-01	8.1217
2011-01-01	7.8880
2012-01-01	6.2326
2013-01-01	4.9149
2014-01-01	4.8589
2015-01-01	4.6602
2016-01-01	4.5873
2017-01-01	4.4301