Year	Number of Firms
1997-01-01	2
2003-01-01	5
2004-01-01	1
2005-01-01	1
2006-01-01	2
2007-01-01	4
2008-01-01	6
2009-01-01	4
2010-01-01	9
2011-01-01	13
2012-01-01	17
2013-01-01	17
2014-01-01	19
2015-01-01	12
2016-01-01	9