Year	Number of Firms
1992-01-01	126
1997-01-01	175
2002-01-01	256
2003-01-01	272
2004-01-01	294
2005-01-01	293
2006-01-01	300
2007-01-01	313
2008-01-01	302
2009-01-01	352
2010-01-01	474
2011-01-01	241