Year	Number
2004-01-01	7.01666640735667
2005-01-01	8.59407628014126
2006-01-01	13.05160166080580
2007-01-01	14.19174831199760
2008-01-01	13.62806068191100
2009-01-01	18.52779194524830
2010-01-01	17.75116171378290
2011-01-01	17.75697973166100
2012-01-01	17.36240307236570
2013-01-01	14.02848814883430
2014-01-01	13.84931560393510