Year	Number
2004-01-01	36.2735
2005-01-01	38.1884
2006-01-01	41.8708
2007-01-01	49.0556
2008-01-01	54.3797
2009-01-01	57.4302
2010-01-01	59.5086
2011-01-01	50.4871
2012-01-01	51.8252
2013-01-01	49.8782
2014-01-01	51.1934
2015-01-01	49.0144
2016-01-01	48.1979
2017-01-01	45.9533