Year	Number
2004-01-01	316
2005-01-01	316
2006-01-01	316
2007-01-01	316
2008-01-01	321
2009-01-01	535
2010-01-01	541
2011-01-01	576
2012-01-01	618
2013-01-01	649
2014-01-01	697
2015-01-01	693
2016-01-01	688