Year	Number
2004-01-01	635
2005-01-01	790
2006-01-01	912
2007-01-01	1009
2008-01-01	1200
2009-01-01	1344
2010-01-01	2121
2011-01-01	2013
2012-01-01	2089
2013-01-01	2145
2014-01-01	2260
2015-01-01	2191
2016-01-01	2267