Year	Number of Firms
1992-01-01	22
1997-01-01	35
2002-01-01	26
2003-01-01	27
2004-01-01	16
2005-01-01	23
2006-01-01	24
2007-01-01	27
2008-01-01	39
2009-01-01	51
2010-01-01	37
2011-01-01	27