Year	Number
2004-01-01	1418
2005-01-01	4638
2006-01-01	5797
2007-01-01	11184
2008-01-01	12776
2009-01-01	17226
2010-01-01	21874
2011-01-01	24371
2012-01-01	16253
2013-01-01	70626