Year	Number
2004-01-01	0.0000
2005-01-01	0.0000
2006-01-01	0.0000
2007-01-01	0.0000
2008-01-01	0.0000
2009-01-01	0.0000
2010-01-01	0.0000
2011-01-01	18.9823
2012-01-01	21.4546
2013-01-01	20.9406
2014-01-01	24.1362
2015-01-01	26.2237
2016-01-01	23.7705
2017-01-01	28.1725