Year	Number
2004-01-01	5.6715
2005-01-01	6.2193
2006-01-01	18.5252
2007-01-01	21.1838
2008-01-01	22.0597
2009-01-01	19.1933
2010-01-01	7.5689
2011-01-01	7.0910
2012-01-01	6.8172
2013-01-01	7.0595
2014-01-01	7.5325
2015-01-01	6.7794
2016-01-01	5.3159