Year	Number
2004-01-01	4.6950
2005-01-01	4.1742
2006-01-01	3.7789
2007-01-01	5.2068
2008-01-01	6.2644
2009-01-01	6.4785
2010-01-01	6.5607
2011-01-01	6.4052
2012-01-01	5.8145
2013-01-01	5.9038
2014-01-01	5.5478
2015-01-01	5.4181
2016-01-01	5.3629