Year	Number of Firms
1992-01-01	11
1997-01-01	10
2002-01-01	3
2003-01-01	10
2004-01-01	9
2005-01-01	8
2006-01-01	12
2007-01-01	12
2008-01-01	9
2009-01-01	8
2010-01-01	17
2011-01-01	5