Year	Number of Firms
1992-01-01	88
1997-01-01	115
2002-01-01	158
2003-01-01	167
2004-01-01	156
2005-01-01	156
2006-01-01	179
2007-01-01	219
2008-01-01	247
2009-01-01	238
2010-01-01	256
2011-01-01	135