Year	Number
2004-01-01	14238
2005-01-01	14371
2006-01-01	14586
2007-01-01	14961
2008-01-01	15671
2009-01-01	15743
2010-01-01	14733
2011-01-01	16812
2012-01-01	17090
2013-01-01	17123
2014-01-01	19053
2015-01-01	18692
2016-01-01	19103
2017-01-01	17441