Year	Number of Firms
1992-01-01	32
1997-01-01	36
2002-01-01	41
2003-01-01	46
2004-01-01	42
2005-01-01	43
2006-01-01	33
2007-01-01	42
2008-01-01	49
2009-01-01	46
2010-01-01	46
2011-01-01	32