Year	Number
2004-01-01	2.2134
2005-01-01	3.4197
2006-01-01	3.9961
2007-01-01	4.9267
2008-01-01	5.3545
2009-01-01	6.2283
2010-01-01	6.9095
2011-01-01	7.3289
2012-01-01	8.3745
2013-01-01	9.3741
2014-01-01	11.4286
2015-01-01	18.7260
2016-01-01	21.7436