Year	Number of Firms
1997-01-01	10
2002-01-01	7
2003-01-01	7
2004-01-01	7
2005-01-01	15
2006-01-01	14
2007-01-01	17
2008-01-01	21
2009-01-01	21
2010-01-01	21
2011-01-01	20
2012-01-01	16
2013-01-01	11
2014-01-01	17
2015-01-01	18
2016-01-01	20