Year	Number of Firms
1997-01-01	2
2005-01-01	3
2007-01-01	7
2008-01-01	2
2009-01-01	1
2010-01-01	2
2011-01-01	4
2012-01-01	2
2013-01-01	1
2014-01-01	1
2015-01-01	2
2016-01-01	11