Year	Number
2004-01-01	15.4240
2005-01-01	16.9678
2006-01-01	18.8175
2007-01-01	20.9096
2008-01-01	29.3683
2009-01-01	31.1761
2010-01-01	32.5527
2011-01-01	41.1439
2012-01-01	40.6242
2013-01-01	44.5894
2014-01-01	50.0426
2015-01-01	65.7269
2016-01-01	48.4741
2017-01-01	55.0431