Year	Number of Firms
1992-01-01	14
1997-01-01	11
2002-01-01	10
2003-01-01	18
2004-01-01	17
2005-01-01	17
2006-01-01	13
2007-01-01	15
2008-01-01	22
2009-01-01	20
2010-01-01	23
2011-01-01	16