Year	Number
2004-01-01	57.3580
2005-01-01	56.7961
2006-01-01	55.6206
2007-01-01	55.2788
2008-01-01	53.9507
2009-01-01	52.6770
2010-01-01	51.7665
2011-01-01	50.2414
2012-01-01	48.8792
2013-01-01	47.4440
2014-01-01	46.0252
2015-01-01	44.3477
2016-01-01	42.4637