Year	Number of Firms
1997-01-01	2
2002-01-01	6
2003-01-01	5
2004-01-01	4
2005-01-01	5
2006-01-01	4
2007-01-01	8
2008-01-01	4
2009-01-01	5
2010-01-01	11
2011-01-01	14
2012-01-01	14
2013-01-01	15
2014-01-01	9
2015-01-01	15
2016-01-01	13