Year	Number of Firms
1992-01-01	1
1997-01-01	2
2004-01-01	1
2005-01-01	2
2006-01-01	3
2008-01-01	2
2009-01-01	1
2010-01-01	4
2011-01-01	6
2013-01-01	6
2014-01-01	4
2015-01-01	3
2016-01-01	4