Year	Number of Firms
1997-01-01	2
2002-01-01	11
2003-01-01	11
2004-01-01	18
2005-01-01	33
2006-01-01	25
2007-01-01	27
2008-01-01	19
2009-01-01	10
2010-01-01	4
2011-01-01	5
2012-01-01	1
2014-01-01	1
2016-01-01	2