Year	Number of Firms
1992-01-01	17
1997-01-01	31
2002-01-01	28
2003-01-01	33
2004-01-01	34
2005-01-01	41
2006-01-01	31
2007-01-01	46
2008-01-01	40
2009-01-01	44
2010-01-01	50
2011-01-01	24