Year	Number of Firms
1992-01-01	32
1997-01-01	33
2002-01-01	33
2003-01-01	27
2004-01-01	41
2005-01-01	41
2006-01-01	43
2007-01-01	48
2008-01-01	47
2009-01-01	53
2010-01-01	58
2011-01-01	41