Year	Number of Firms
1992-01-01	1
1997-01-01	3
2002-01-01	1
2003-01-01	1
2005-01-01	2
2006-01-01	2
2007-01-01	1
2009-01-01	2
2010-01-01	2
2011-01-01	1
2012-01-01	3
2014-01-01	2
2015-01-01	1