Year	Number
2004-01-01	5.1662
2005-01-01	5.2760
2006-01-01	5.7219
2007-01-01	5.9697
2008-01-01	6.5785
2009-01-01	7.6343
2010-01-01	8.1030
2011-01-01	14.7069
2012-01-01	16.8959
2013-01-01	17.6980
2014-01-01	17.9184
2015-01-01	17.7549
2016-01-01	17.3871