Year	Number
2004-01-01	10.5775
2005-01-01	11.2476
2006-01-01	12.2049
2007-01-01	12.9866
2008-01-01	12.8281
2009-01-01	12.6526
2010-01-01	12.2377
2011-01-01	7.8342
2012-01-01	7.8501
2013-01-01	7.2916
2014-01-01	6.4964
2015-01-01	5.7622
2016-01-01	5.2514
2017-01-01	5.2354