Year	Number of Firms
1992-01-01	11
1997-01-01	23
2002-01-01	15
2003-01-01	27
2004-01-01	23
2005-01-01	33
2006-01-01	31
2007-01-01	24
2008-01-01	37
2009-01-01	29
2010-01-01	33
2011-01-01	19