Table 2.

Some static statistical parameters calculated for successive snapshots

	2005	2006	2007	2008	2009	2010	2011
Ave. degree	1.40	1.32	1.63	1.84	1.98	2.02	2.04
Diameter	4	5	5	6	6	6	6
Density	0.31	0.04	0.04	0.02	0.02	0.01	0.01
#Communities	4	3	6	8	8	15	12
Modularity	0.17	0.52	0.46	0.47	0.46	0.54	0.54
Ave. clustering coefficient	0.41	0.06	0.21	0.22	0.20	0.24	0.23
Ave. path length	2.04	3.04	3.06	3.26	3.34	3.46	3.50
Ave. normalized closeness	0.51	0.33	0.33	0.31	0.30	0.29	0.29
Ave. eccentricity	3.10	4.41	4.40	4.70	4.80	4.83	4.83
Ave. betweenness	4.70	58.36	83.53	169.70	234.89	354.23	456.18
Ave. normalized betweenness	0.13	0.03	0.02	0.01	0.01	$\approx$ 0	$\approx$ 0
Ave. page rank	0.10	0.01	0.01	$\approx$ 0	$\approx$ 0	$\approx$ 0	$\approx$ 0
Ave. eigenvector	0.52	0.19	0.15	0.10	0.09	0.07	0.05