Year	Number of Firms
1992-01-01	8
1997-01-01	11
2002-01-01	8
2003-01-01	9
2004-01-01	17
2005-01-01	11
2006-01-01	12
2007-01-01	8
2008-01-01	18
2009-01-01	18
2010-01-01	21
2011-01-01	7