Year	Number
2004-01-01	22900000
2005-01-01	23573538
2006-01-01	23473267
2007-01-01	23746058
2008-01-01	23824735
2009-01-01	23819366
2010-01-01	24048862
2011-01-01	23430877
2012-01-01	22488939
2013-01-01	23482098
2014-01-01	23346479
2015-01-01	22164795
2016-01-01	22220141