Year	Number of Firms
1997-01-01	4
2002-01-01	13
2003-01-01	14
2004-01-01	18
2005-01-01	7
2006-01-01	16
2007-01-01	21
2008-01-01	18
2009-01-01	17
2010-01-01	23
2011-01-01	29
2012-01-01	28
2013-01-01	22
2014-01-01	26
2015-01-01	22
2016-01-01	19