Year	Number of Firms
2002-01-01	3
2007-01-01	2
2008-01-01	2
2009-01-01	3
2010-01-01	3
2011-01-01	4
2012-01-01	4
2013-01-01	2
2014-01-01	4
2015-01-01	5
2016-01-01	5