Year	Number of Firms
1992-01-01	18
1997-01-01	37
2002-01-01	25
2003-01-01	31
2004-01-01	25
2005-01-01	30
2006-01-01	33
2007-01-01	39
2008-01-01	44
2009-01-01	39
2010-01-01	49
2011-01-01	30