Year	Number of Firms
1992-01-01	6
1997-01-01	10
2002-01-01	13
2003-01-01	10
2004-01-01	16
2005-01-01	19
2006-01-01	17
2007-01-01	22
2008-01-01	20
2009-01-01	23
2010-01-01	26
2011-01-01	10