Year	Number
2004-01-01	30.2462
2005-01-01	29.5765
2006-01-01	30.5122
2007-01-01	33.0102
2008-01-01	32.2482
2009-01-01	30.0067
2010-01-01	44.4954
2011-01-01	45.9678
2012-01-01	46.7536
2013-01-01	46.1348
2014-01-01	44.8453
2015-01-01	44.2982
2016-01-01	37.5979
2017-01-01	43.8642