Year	Number
2004-01-01	6.5181
2005-01-01	6.7521
2006-01-01	7.3335
2007-01-01	8.2087
2008-01-01	9.1875
2009-01-01	9.7864
2010-01-01	9.8615
2011-01-01	10.0015
2012-01-01	9.6975
2013-01-01	10.2030
2014-01-01	10.8279
2015-01-01	10.6606