Year	Number
2004-01-01	18.3235
2005-01-01	24.2885
2006-01-01	33.7600
2007-01-01	42.2756
2008-01-01	53.3792
2009-01-01	56.5361
2010-01-01	59.2413
2011-01-01	64.8424
2012-01-01	64.9602
2013-01-01	63.8427
2014-01-01	65.0681
2015-01-01	68.5656
2016-01-01	66.6771
2017-01-01	66.3296