Year	Number of Firms
1997-01-01	7
2002-01-01	7
2003-01-01	13
2004-01-01	9
2005-01-01	11
2006-01-01	13
2007-01-01	14
2008-01-01	11
2009-01-01	10
2010-01-01	21
2011-01-01	10
2012-01-01	20
2013-01-01	20
2014-01-01	20
2015-01-01	22
2016-01-01	21