Year	Number of Firms
1992-01-01	4
1997-01-01	3
2002-01-01	1
2003-01-01	1
2004-01-01	3
2005-01-01	3
2006-01-01	3
2007-01-01	1
2009-01-01	3
2010-01-01	3
2011-01-01	8
2012-01-01	3
2013-01-01	1
2014-01-01	1
2015-01-01	1
2016-01-01	2