Year	Number of Firms
1992-01-01	1
2005-01-01	1
2007-01-01	3
2008-01-01	3
2009-01-01	1
2010-01-01	1
2011-01-01	1
2012-01-01	3
2013-01-01	4
2014-01-01	3
2015-01-01	4
2016-01-01	3