Year	Number
2004-01-01	3.8463
2005-01-01	4.2811
2006-01-01	4.8699
2007-01-01	7.8529
2008-01-01	8.8783
2009-01-01	8.9702
2010-01-01	9.0834
2011-01-01	6.1744
2012-01-01	6.6974
2013-01-01	6.8702
2014-01-01	6.3107
2015-01-01	6.5616
2016-01-01	6.7626
2017-01-01	7.1184