Year

NO. of nodes

NO. of connections

Year

NO. of nodes

NO. of connections

2001

150

7079

2010

150

7429

2002

150

7094

2011

150

7417

2003

150

7385

2012

150

7426

2004

150

7401

2013

150

7419

2005

150

7408

2014

150

7408

2006

150

7404

2015

150

7417

2007

150

7425

2016

150

7409

2008

150

7423

2017

150

7412

2009

150

7424

2018

150

7426