Year	Number of Firms
1997-01-01	4
2002-01-01	6
2003-01-01	8
2004-01-01	16
2005-01-01	13
2006-01-01	12
2007-01-01	16
2008-01-01	20
2009-01-01	20
2010-01-01	24
2011-01-01	23
2012-01-01	23
2013-01-01	28
2014-01-01	21
2015-01-01	22
2016-01-01	16