Year	Number of Firms
1992-01-01	4
1997-01-01	4
2002-01-01	9
2003-01-01	12
2004-01-01	5
2005-01-01	4
2007-01-01	2
2008-01-01	1
2009-01-01	4
2010-01-01	3
2011-01-01	2
2012-01-01	1
2013-01-01	1