Year	Number
2004-01-01	10.3186
2005-01-01	11.4427
2006-01-01	12.3260
2007-01-01	12.5162
2008-01-01	13.1889
2009-01-01	14.0265
2010-01-01	15.1246
2011-01-01	16.8331
2012-01-01	18.8854
2013-01-01	21.9657
2014-01-01	23.2350
2015-01-01	25.1211
2016-01-01	27.1489