Year	Number of Firms
1997-01-01	2
2002-01-01	15
2003-01-01	19
2004-01-01	15
2005-01-01	22
2006-01-01	12
2007-01-01	20
2008-01-01	16
2009-01-01	22
2010-01-01	23
2011-01-01	21
2012-01-01	35
2013-01-01	31
2014-01-01	27
2015-01-01	23
2016-01-01	22