Year	Number
2004-01-01	5.8566
2005-01-01	6.0755
2006-01-01	6.6776
2007-01-01	7.2250
2008-01-01	8.4291
2009-01-01	8.9765
2010-01-01	11.0564
2011-01-01	12.2605
2012-01-01	12.4247
2013-01-01	14.1762
2014-01-01	15.3804
2015-01-01	15.9825
2016-01-01	17.8435
2017-01-01	17.7887