Year	Number of Firms
1997-01-01	1
2003-01-01	4
2004-01-01	8
2005-01-01	7
2006-01-01	3
2007-01-01	1
2008-01-01	1
2009-01-01	2
2010-01-01	1
2011-01-01	1
2012-01-01	2
2015-01-01	1