Year	Number
2004-01-01	1400
2005-01-01	3103
2006-01-01	4333
2007-01-01	12920
2008-01-01	23909
2009-01-01	23788
2010-01-01	32979
2011-01-01	38359
2012-01-01	43407
2013-01-01	36120