Year	Number of Firms
1992-01-01	4
1997-01-01	7
2002-01-01	12
2003-01-01	8
2004-01-01	3
2007-01-01	2
2008-01-01	2
2009-01-01	2
2010-01-01	4
2011-01-01	1
2012-01-01	1
2015-01-01	1