Year	Number
2004-01-01	23.8460
2005-01-01	30.6769
2006-01-01	31.8568
2007-01-01	34.7754
2008-01-01	36.1623
2009-01-01	38.0460
2010-01-01	40.0124
2011-01-01	42.9104
2012-01-01	45.4150
2013-01-01	48.8719
2014-01-01	51.0246
2015-01-01	55.4130
2016-01-01	58.9526