Year	Number of Firms
1997-01-01	3
2002-01-01	3
2003-01-01	2
2004-01-01	1
2005-01-01	2
2006-01-01	1
2007-01-01	2
2008-01-01	1
2010-01-01	1
2011-01-01	2
2012-01-01	1
2016-01-01	1