Table 1.

General characteristics of the networks

	N node	N link	Average degree	Average path length	Network diameter
Overall	5,938	53,742	18.10	2.48	5
1990	368	1,312	7.13	2.71	6
2000	1,067	5,709	10.7	2.59	5
2010	2,641	18,042	13.66	2.62	5