Year	Number of Firms
1997-01-01	5
2002-01-01	5
2003-01-01	8
2004-01-01	20
2005-01-01	17
2006-01-01	21
2007-01-01	17
2008-01-01	21
2009-01-01	10
2010-01-01	10
2011-01-01	14
2012-01-01	17
2013-01-01	16
2014-01-01	14
2015-01-01	16
2016-01-01	17