Year	Number
2004-01-01	50.0797
2005-01-01	50.1989
2006-01-01	50.5190
2007-01-01	51.8562
2008-01-01	50.4496
2009-01-01	45.7968
2010-01-01	40.8622
2011-01-01	38.7251
2012-01-01	34.0839
2013-01-01	30.0148
2014-01-01	27.7860
2015-01-01	24.6921
2016-01-01	24.0373
2017-01-01	20.8574