Year	Number
2004-01-01	3.9318
2005-01-01	3.5871
2006-01-01	3.3258
2007-01-01	4.6971
2008-01-01	5.7962
2009-01-01	6.1508
2010-01-01	6.3935
2011-01-01	6.4012
2012-01-01	5.9620
2013-01-01	6.2145
2014-01-01	5.9993
2015-01-01	6.0235
2016-01-01	6.1234