Year	Number
2004-01-01	26.6901
2005-01-01	28.3665
2006-01-01	30.3543
2007-01-01	33.6994
2008-01-01	35.5581
2009-01-01	34.6261
2010-01-01	35.0458
2011-01-01	36.7112
2012-01-01	38.2167
2013-01-01	38.4955
2014-01-01	37.0206
2015-01-01	32.9093
2016-01-01	30.1384