Year	Number of Firms
2002-01-01	5
2003-01-01	10
2004-01-01	7
2005-01-01	11
2006-01-01	10
2007-01-01	8
2008-01-01	12
2009-01-01	4
2010-01-01	5
2011-01-01	2
2012-01-01	1