Year	Number
2004-01-01	13.1695
2005-01-01	14.4127
2006-01-01	16.9472
2007-01-01	16.1103
2008-01-01	16.0664
2009-01-01	14.9679
2010-01-01	15.5008
2011-01-01	15.0879
2012-01-01	13.5925
2013-01-01	12.2042
2014-01-01	12.0644
2015-01-01	6.5482
2016-01-01	5.4401
2017-01-01	1.4362