Year	Number of Firms
1997-01-01	10
2002-01-01	27
2003-01-01	26
2004-01-01	23
2005-01-01	27
2006-01-01	27
2007-01-01	31
2008-01-01	35
2009-01-01	31
2010-01-01	35
2011-01-01	32
2012-01-01	41
2013-01-01	33
2014-01-01	46
2015-01-01	48
2016-01-01	53