Year	Number of Firms
1992-01-01	9
1997-01-01	12
2002-01-01	11
2003-01-01	15
2004-01-01	18
2005-01-01	13
2006-01-01	23
2007-01-01	14
2008-01-01	17
2009-01-01	17
2010-01-01	23
2011-01-01	16