Year	Number
2004-01-01	59.1381
2005-01-01	58.7640
2006-01-01	59.9298
2007-01-01	59.7840
2008-01-01	59.2247
2009-01-01	57.5997
2010-01-01	55.2462
2011-01-01	54.4665
2012-01-01	52.7179
2013-01-01	50.4754
2014-01-01	48.3049
2015-01-01	45.8111
2016-01-01	39.0459