Year	Number
2004-01-01	34.1785
2005-01-01	35.3333
2006-01-01	38.1617
2007-01-01	40.2121
2008-01-01	42.6582
2009-01-01	42.2704
2010-01-01	41.2588
2011-01-01	39.6210
2012-01-01	37.7083
2013-01-01	32.5224
2014-01-01	28.1651
2015-01-01	26.8090
2016-01-01	24.6824
2017-01-01	22.9116