Year	Number of Firms
1997-01-01	3
2002-01-01	4
2003-01-01	11
2004-01-01	6
2005-01-01	13
2006-01-01	13
2007-01-01	16
2008-01-01	18
2009-01-01	7
2010-01-01	12
2011-01-01	17
2012-01-01	23
2013-01-01	31
2014-01-01	33
2015-01-01	33
2016-01-01	28