Year	Number
2004-01-01	2033
2005-01-01	2223
2006-01-01	2452
2007-01-01	2748
2008-01-01	3138
2009-01-01	4425
2010-01-01	4787
2011-01-01	5113
2012-01-01	5447
2013-01-01	5711
2014-01-01	5915
2015-01-01	6139
2016-01-01	6283
2017-01-01	6346