Year	Number
2004-01-01	29.2871
2005-01-01	29.3714
2006-01-01	29.4992
2007-01-01	29.4724
2008-01-01	29.6802
2009-01-01	29.5876
2010-01-01	30.3000
2011-01-01	29.1173
2012-01-01	31.2582
2013-01-01	31.1281
2014-01-01	30.8787
2015-01-01	30.9099
2016-01-01	30.9382