Year	Number
2004-01-01	14.0266
2005-01-01	15.1442
2006-01-01	16.1640
2007-01-01	16.7215
2008-01-01	19.0943
2009-01-01	5.3579
2010-01-01	4.7479
2011-01-01	5.2492
2012-01-01	5.4171
2013-01-01	6.3835
2014-01-01	7.1955
2015-01-01	7.4424
2016-01-01	8.2219
2017-01-01	9.2500