Year	Number of Firms
1997-01-01	139
2002-01-01	151
2003-01-01	196
2004-01-01	198
2005-01-01	228
2006-01-01	226
2007-01-01	248
2008-01-01	277
2009-01-01	242
2010-01-01	275
2011-01-01	273
2012-01-01	278
2013-01-01	273
2014-01-01	276
2015-01-01	271
2016-01-01	267