Year	Number
2004-01-01	9649
2005-01-01	21108
2006-01-01	89936
2007-01-01	155922
2008-01-01	587211
2009-01-01	664985
2010-01-01	673778
2011-01-01	801289
2012-01-01	914888
2013-01-01	1063322
2014-01-01	1253831
2015-01-01	1478713
2016-01-01	1916972