Year	Number
2004-01-01	5.0012
2005-01-01	5.6617
2006-01-01	6.1099
2007-01-01	6.4638
2008-01-01	6.3930
2009-01-01	5.4258
2010-01-01	5.1899
2011-01-01	4.6001
2012-01-01	4.2227
2013-01-01	3.6565
2014-01-01	3.2319
2015-01-01	2.9016
2016-01-01	2.7129