Year	Number of Firms
1997-01-01	1
2003-01-01	1
2004-01-01	1
2005-01-01	2
2006-01-01	1
2007-01-01	2
2008-01-01	2
2009-01-01	1
2013-01-01	1
2014-01-01	2
2016-01-01	1