Year	Number of Firms
1997-01-01	5
2002-01-01	13
2003-01-01	17
2004-01-01	13
2005-01-01	20
2006-01-01	18
2007-01-01	35
2008-01-01	39
2009-01-01	32
2010-01-01	30
2011-01-01	30
2012-01-01	27
2013-01-01	31
2014-01-01	35
2015-01-01	27
2016-01-01	31