Year	Number of Firms
1997-01-01	2
2002-01-01	7
2003-01-01	10
2004-01-01	9
2005-01-01	17
2006-01-01	18
2007-01-01	13
2008-01-01	25
2009-01-01	8
2010-01-01	12
2011-01-01	17
2012-01-01	18
2013-01-01	21
2014-01-01	21
2015-01-01	21
2016-01-01	23