Year	Number
2004-01-01	977
2005-01-01	951
2006-01-01	941
2007-01-01	921
2008-01-01	923
2009-01-01	930
2010-01-01	911
2011-01-01	903
2012-01-01	867
2013-01-01	683
2014-01-01	616
2015-01-01	569
2016-01-01	552
2017-01-01	473