Year	Number of Firms
1992-01-01	20
1997-01-01	24
2002-01-01	22
2003-01-01	29
2004-01-01	26
2005-01-01	27
2006-01-01	36
2007-01-01	25
2008-01-01	34
2009-01-01	37
2010-01-01	46
2011-01-01	22