Year	Number of Firms
1997-01-01	2
2002-01-01	2
2003-01-01	2
2007-01-01	1
2008-01-01	3
2009-01-01	1
2010-01-01	1
2011-01-01	3
2012-01-01	3
2013-01-01	2
2014-01-01	2
2015-01-01	1
2016-01-01	1