Year	Number of Firms
1997-01-01	4
2002-01-01	14
2003-01-01	21
2004-01-01	21
2005-01-01	17
2006-01-01	16
2007-01-01	21
2008-01-01	24
2009-01-01	21
2010-01-01	20
2011-01-01	25
2012-01-01	33
2013-01-01	36
2014-01-01	44
2015-01-01	44
2016-01-01	40