Year	Number
2004-01-01	670
2005-01-01	639
2006-01-01	508
2007-01-01	504
2008-01-01	495
2009-01-01	475
2010-01-01	468
2011-01-01	457
2012-01-01	442
2013-01-01	429
2014-01-01	409
2015-01-01	397
2016-01-01	388
2017-01-01	382