Year	Number
2004-01-01	12641
2005-01-01	13147
2006-01-01	14046
2007-01-01	16277
2008-01-01	17424
2009-01-01	17828
2010-01-01	19200
2011-01-01	20372
2012-01-01	23229
2013-01-01	27876
2014-01-01	37930
2015-01-01	31919
2016-01-01	43808