Year	Number
2004-01-01	13.9883
2005-01-01	19.5468
2006-01-01	25.4039
2007-01-01	36.1297
2008-01-01	48.2721
2009-01-01	49.9517
2010-01-01	52.0662
2011-01-01	56.9582
2012-01-01	62.4042
2013-01-01	69.6506
2014-01-01	63.1739
2015-01-01	57.5429
2016-01-01	58.3179
2017-01-01	63.8765