Year	Number
2004-01-01	24.1511
2005-01-01	20.8040
2006-01-01	20.6612
2007-01-01	22.0570
2008-01-01	23.4031
2009-01-01	21.6393
2010-01-01	21.4609
2011-01-01	21.3480
2012-01-01	19.7233
2013-01-01	21.1231
2014-01-01	17.9829
2015-01-01	29.7150