Year	Number
2004-01-01	27.3483
2005-01-01	27.6483
2006-01-01	27.9697
2007-01-01	28.1176
2008-01-01	28.4701
2009-01-01	28.5249
2010-01-01	29.3595
2011-01-01	28.3496
2012-01-01	30.5868
2013-01-01	30.6288
2014-01-01	30.5539
2015-01-01	30.7402
2016-01-01	30.9283