Year	Number of Firms
1997-01-01	2
2002-01-01	3
2003-01-01	10
2004-01-01	6
2005-01-01	2
2006-01-01	5
2007-01-01	6
2008-01-01	8
2009-01-01	9
2010-01-01	8
2011-01-01	13
2012-01-01	16
2013-01-01	15
2014-01-01	13
2015-01-01	15
2016-01-01	17