Year	Number
2004-01-01	24.1461
2005-01-01	25.8900
2006-01-01	25.4217
2007-01-01	31.1701
2008-01-01	26.4195
2009-01-01	24.9476
2010-01-01	35.8213
2011-01-01	35.3943
2012-01-01	38.1770
2013-01-01	27.0409
2014-01-01	25.2713
2015-01-01	32.0075
2016-01-01	27.9386