Year	Number of Firms
1997-01-01	6
2002-01-01	1
2003-01-01	1
2004-01-01	1
2005-01-01	1
2006-01-01	2
2007-01-01	1
2008-01-01	1
2009-01-01	1
2011-01-01	2
2012-01-01	4
2013-01-01	5
2016-01-01	1