Year	Number of Firms
1992-01-01	1
1997-01-01	1
2002-01-01	2
2003-01-01	1
2004-01-01	1
2008-01-01	1
2009-01-01	1
2010-01-01	2
2012-01-01	1
2014-01-01	2
2015-01-01	2
2016-01-01	4