Year	Number
2004-01-01	11.0893
2005-01-01	10.6174
2006-01-01	12.2297
2007-01-01	13.1986
2008-01-01	16.2109
2009-01-01	16.9707
2010-01-01	17.2879
2011-01-01	16.3759
2012-01-01	16.7724
2013-01-01	16.8914
2014-01-01	17.0103
2015-01-01	16.9310
2016-01-01	17.1689