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 |