Year	Number
2004-01-01	22.6867
2005-01-01	23.0897
2006-01-01	23.4950
2007-01-01	24.2770
2008-01-01	25.6139
2009-01-01	26.9384
2010-01-01	28.7193
2011-01-01	30.6519
2012-01-01	33.2357
2013-01-01	35.8901
2014-01-01	39.6947
2015-01-01	42.5449
2016-01-01	44.9510