Year	Number of Firms
2002-01-01	3
2003-01-01	3
2004-01-01	2
2007-01-01	4
2008-01-01	6
2009-01-01	4
2010-01-01	3
2011-01-01	5
2012-01-01	1
2013-01-01	1
2015-01-01	2