Year	Number
2004-01-01	20.5224
2005-01-01	22.8061
2006-01-01	24.0021
2007-01-01	25.4297
2008-01-01	27.9453
2009-01-01	29.2501
2010-01-01	29.3370
2011-01-01	29.3445
2012-01-01	30.6334
2013-01-01	33.3958
2014-01-01	33.4239
2015-01-01	35.7967
2016-01-01	36.6448