Year	Number of Firms
1992-01-01	248
1997-01-01	427
2002-01-01	500
2003-01-01	493
2004-01-01	523
2005-01-01	500
2006-01-01	478
2007-01-01	483
2008-01-01	506
2009-01-01	460
2010-01-01	463
2011-01-01	456
2012-01-01	444
2013-01-01	439
2014-01-01	484
2015-01-01	477
2016-01-01	411