Year	Number
2004-01-01	30.7479
2005-01-01	34.0720
2006-01-01	38.4118
2007-01-01	39.0582
2008-01-01	41.9206
2009-01-01	45.3370
2010-01-01	47.3684
2011-01-01	50.4155
2012-01-01	52.1699
2013-01-01	54.1090
2014-01-01	59.8338
2015-01-01	61.7729
2016-01-01	65.0970