Year	Number of Firms
1997-01-01	2
2002-01-01	7
2003-01-01	7
2004-01-01	6
2005-01-01	6
2006-01-01	8
2007-01-01	14
2008-01-01	17
2009-01-01	17
2010-01-01	18
2011-01-01	17
2012-01-01	19
2013-01-01	18
2014-01-01	22
2015-01-01	23
2016-01-01	15