Year	Number of Firms
1992-01-01	71
1997-01-01	147
2002-01-01	220
2003-01-01	242
2004-01-01	288
2005-01-01	292
2006-01-01	318
2007-01-01	396
2008-01-01	427
2009-01-01	448
2010-01-01	462
2011-01-01	464
2012-01-01	476
2013-01-01	503
2014-01-01	486
2015-01-01	484
2016-01-01	491