Year	Number of Firms
1992-01-01	24
1997-01-01	25
2002-01-01	28
2003-01-01	23
2004-01-01	21
2005-01-01	24
2006-01-01	21
2007-01-01	27
2008-01-01	26
2009-01-01	36
2010-01-01	36
2011-01-01	17