Year	Number
2004-01-01	11.6723
2005-01-01	12.9630
2006-01-01	14.5342
2007-01-01	16.3300
2008-01-01	17.5084
2009-01-01	19.1358
2010-01-01	20.2581
2011-01-01	21.8294
2012-01-01	21.5488
2013-01-01	23.6813
2014-01-01	24.8036
2015-01-01	25.0842
2016-01-01	25.6453
2017-01-01	26.0943