Year	Number
2004-01-01	14.0635
2005-01-01	14.9097
2006-01-01	16.7254
2007-01-01	19.1327
2008-01-01	20.3761
2009-01-01	22.0904
2010-01-01	25.4684
2011-01-01	29.0813
2012-01-01	33.1781
2013-01-01	53.6207
2014-01-01	54.5142
2015-01-01	51.4578
2016-01-01	53.7571