Year	Number of Firms
1992-01-01	3
1997-01-01	4
2002-01-01	9
2003-01-01	14
2004-01-01	14
2005-01-01	12
2006-01-01	10
2007-01-01	10
2008-01-01	9
2009-01-01	11
2010-01-01	16
2011-01-01	11