Year	Number
2004-01-01	23.7991
2005-01-01	23.8330
2006-01-01	23.8427
2007-01-01	23.0215
2008-01-01	22.7086
2009-01-01	22.7572
2010-01-01	20.7541
2011-01-01	20.5670
2012-01-01	20.1635
2013-01-01	19.3618
2014-01-01	18.5011
2015-01-01	17.1108
2016-01-01	14.6278