Year	Number of Firms
1997-01-01	36
2002-01-01	66
2003-01-01	77
2004-01-01	81
2005-01-01	95
2006-01-01	114
2007-01-01	111
2008-01-01	131
2009-01-01	151
2010-01-01	174
2011-01-01	180
2012-01-01	196
2013-01-01	199
2014-01-01	219
2015-01-01	223
2016-01-01	252