Year	Number of Firms
1992-01-01	17
1997-01-01	18
2002-01-01	13
2003-01-01	11
2004-01-01	12
2005-01-01	9
2006-01-01	11
2007-01-01	11
2008-01-01	17
2009-01-01	15
2010-01-01	15
2011-01-01	8