Year	Number
2004-01-01	2166803.0
2005-01-01	2344712.0
2006-01-01	2554392.0
2007-01-01	2847754.0
2008-01-01	3048487.5
2009-01-01	3191235.0
2010-01-01	3443985.0
2011-01-01	3355929.0
2012-01-01	3542555.0
2013-01-01	3836002.0
2014-01-01	3477264.0
2015-01-01	2002647.0
2016-01-01	1965405.0
2017-01-01	2395048.0