Year	Number of Firms
1997-01-01	4
2002-01-01	4
2003-01-01	6
2004-01-01	6
2005-01-01	6
2006-01-01	6
2007-01-01	10
2008-01-01	19
2009-01-01	19
2010-01-01	20
2011-01-01	15
2012-01-01	13
2013-01-01	18
2014-01-01	14
2015-01-01	11
2016-01-01	16