Year	Number
2004-01-01	7.8940
2005-01-01	19.9132
2006-01-01	31.8403
2007-01-01	51.7437
2008-01-01	58.1755
2009-01-01	40.1414
2010-01-01	35.2519
2011-01-01	34.8599
2012-01-01	38.6560
2013-01-01	41.5964
2014-01-01	45.7146
2015-01-01	45.3716
2016-01-01	37.5837
2017-01-01	60.9008