Year	Number
2004-01-01	15.2697
2005-01-01	16.3851
2006-01-01	23.6997
2007-01-01	24.8366
2008-01-01	27.7274
2009-01-01	44.4134
2010-01-01	46.8175
2011-01-01	52.6958
2012-01-01	61.1512
2013-01-01	50.2689
2014-01-01	49.4100
2015-01-01	50.9807
2016-01-01	46.9870