Year	Number
2004-01-01	30.6643
2005-01-01	30.6410
2006-01-01	31.2382
2007-01-01	31.6687
2008-01-01	31.5630
2009-01-01	31.2111
2010-01-01	30.7473
2011-01-01	30.4056
2012-01-01	30.9342
2013-01-01	30.1344
2014-01-01	29.1620
2015-01-01	28.7645
2016-01-01	27.7960