Year	Number of Firms
1997-01-01	12
2002-01-01	8
2003-01-01	12
2004-01-01	9
2005-01-01	17
2006-01-01	23
2007-01-01	21
2008-01-01	20
2009-01-01	21
2010-01-01	17
2011-01-01	21
2012-01-01	25
2013-01-01	27
2014-01-01	23
2015-01-01	30
2016-01-01	31