Year	Number
2004-01-01	13.2759
2005-01-01	13.0873
2006-01-01	13.0955
2007-01-01	13.0472
2008-01-01	12.9820
2009-01-01	12.8505
2010-01-01	12.8773
2011-01-01	12.9979
2012-01-01	13.0953
2013-01-01	13.1330
2014-01-01	13.1270
2015-01-01	13.1688
2016-01-01	13.3689
2017-01-01	13.5789