Year	Number of Firms
1997-01-01	2
2002-01-01	10
2003-01-01	8
2004-01-01	16
2005-01-01	15
2006-01-01	17
2007-01-01	17
2008-01-01	23
2009-01-01	10
2010-01-01	6
2011-01-01	4
2012-01-01	6
2014-01-01	1
2015-01-01	1