Year	Number
2004-01-01	20.7432
2005-01-01	20.7142
2006-01-01	20.6997
2007-01-01	20.6271
2008-01-01	20.5981
2009-01-01	20.5400
2010-01-01	20.4674
2011-01-01	25.6060
2012-01-01	25.4754
2013-01-01	24.9528
2014-01-01	24.7931
2015-01-01	24.9964
2016-01-01	24.8512
2017-01-01	24.5899