Year	Number of Firms
2002-01-01	1
2003-01-01	2
2004-01-01	1
2006-01-01	1
2007-01-01	3
2008-01-01	3
2009-01-01	3
2010-01-01	1
2011-01-01	4
2012-01-01	3
2013-01-01	2
2015-01-01	1