Year	Number
2004-01-01	17.2913
2005-01-01	16.4236
2006-01-01	18.7889
2007-01-01	19.9710
2008-01-01	24.3490
2009-01-01	25.3131
2010-01-01	25.6476
2011-01-01	24.1621
2012-01-01	24.6507
2013-01-01	24.7573
2014-01-01	24.8719
2015-01-01	24.6942
2016-01-01	25.0018