Year	Number
2004-01-01	14.7667
2005-01-01	15.8633
2006-01-01	18.8306
2007-01-01	31.6510
2008-01-01	28.6855
2009-01-01	27.4309
2010-01-01	28.9635
2011-01-01	26.5834
2012-01-01	25.9283
2013-01-01	27.0284
2014-01-01	27.9387
2015-01-01	31.1244
2016-01-01	30.9360