Year	Number
2004-01-01	35.2574
2005-01-01	37.4870
2006-01-01	38.3100
2007-01-01	41.9355
2008-01-01	45.5801
2009-01-01	47.8564
2010-01-01	51.3976
2011-01-01	49.7337
2012-01-01	38.9737
2013-01-01	47.7062
2014-01-01	33.2962
2015-01-01	42.0211
2016-01-01	45.5621
2017-01-01	44.2965