Year	Number
2004-01-01	7.7449
2005-01-01	10.5820
2006-01-01	12.7088
2007-01-01	15.4390
2008-01-01	19.6184
2009-01-01	23.3126
2010-01-01	25.7588
2011-01-01	28.5418
2012-01-01	30.9165
2013-01-01	33.5746
2014-01-01	36.1262
2015-01-01	32.4858
2016-01-01	34.9398
2017-01-01	36.7102