Year	Number
2004-01-01	4.7681
2005-01-01	7.1253
2006-01-01	7.3577
2007-01-01	5.9906
2008-01-01	7.8089
2009-01-01	9.2153
2010-01-01	9.9193
2011-01-01	10.3768
2012-01-01	10.0471
2013-01-01	10.1973
2014-01-01	10.9413
2015-01-01	10.5046
2016-01-01	10.1828