Year	Number of Firms
1997-01-01	4
2002-01-01	2
2003-01-01	3
2004-01-01	5
2005-01-01	2
2007-01-01	3
2008-01-01	3
2009-01-01	5
2010-01-01	6
2011-01-01	8
2012-01-01	4
2013-01-01	6
2014-01-01	5
2015-01-01	6
2016-01-01	5