Because inclusion in the index requires at least three sources Afghanistan, Fiji, Liberia, Palestine, and Somalia, with only two sources in 2006, were not included.

• 由于得出指数至少需要三个参数来源，而阿富汗、斐济、利比理亚、巴勒斯坦及索马里在2006年只有两个参数来源，因此未被囊括表中。