Year	Number
2004-01-01	30.0013
2005-01-01	33.8948
2006-01-01	37.0746
2007-01-01	41.9110
2008-01-01	31.7820
2009-01-01	26.5474
2010-01-01	39.8673
2011-01-01	63.9710
2012-01-01	61.1237
2013-01-01	67.2657
2014-01-01	72.3148
2015-01-01	84.1619
2016-01-01	77.8293
2017-01-01	79.5845