Year	Number
2004-01-01	14.3043
2005-01-01	18.9321
2006-01-01	26.2414
2007-01-01	32.4155
2008-01-01	40.2175
2009-01-01	42.1716
2010-01-01	43.9122
2011-01-01	47.8168
2012-01-01	47.7654
2013-01-01	46.8287
2014-01-01	47.5921
2015-01-01	49.9478
2016-01-01	48.3614
2017-01-01	48.1094