Year	Number
2004-01-01	22.3039
2005-01-01	32.0279
2006-01-01	36.6563
2007-01-01	40.9950
2008-01-01	45.7734
2009-01-01	44.1850
2010-01-01	41.7891
2011-01-01	40.2906
2012-01-01	38.0650
2013-01-01	33.9072
2014-01-01	30.6047
2015-01-01	29.7661
2016-01-01	29.7226
2017-01-01	28.1261