Year	Number
2004-01-01	8.7750
2005-01-01	9.0875
2006-01-01	12.1114
2007-01-01	13.3770
2008-01-01	14.2113
2009-01-01	15.0152
2010-01-01	15.9839
2011-01-01	17.3953
2012-01-01	18.0090
2013-01-01	18.3082
2014-01-01	18.4432
2015-01-01	18.5853