Year	Number of Firms
1992-01-01	9
1997-01-01	10
2002-01-01	5
2003-01-01	13
2004-01-01	8
2005-01-01	5
2006-01-01	8
2007-01-01	11
2008-01-01	11
2009-01-01	22
2010-01-01	16
2011-01-01	6