Year	Number of Firms
1992-01-01	74
1997-01-01	85
2002-01-01	82
2003-01-01	86
2004-01-01	85
2005-01-01	83
2006-01-01	95
2007-01-01	110
2008-01-01	140
2009-01-01	140
2010-01-01	162
2011-01-01	100