Year	Number of Firms
1992-01-01	28
1997-01-01	53
2002-01-01	36
2003-01-01	42
2004-01-01	42
2005-01-01	49
2006-01-01	70
2007-01-01	74
2008-01-01	77
2009-01-01	74
2010-01-01	79
2011-01-01	48