Year	Number of Firms
2004-01-01	1
2006-01-01	1
2008-01-01	4
2009-01-01	3
2010-01-01	4
2011-01-01	5
2012-01-01	5
2013-01-01	3
2014-01-01	4
2015-01-01	2
2016-01-01	1