Nigeria - D

  Debt/GDP = 0,17 (17%)
Accumulated deficit for last 5 years/budget income for last 5 years = 0,31
Years since last default = 8 (2004)
5-year inflation = 0,56 (56%)
Budget expences/GDP = 0,13
Trade deficit/GDP = -0,14 (Surplus)
World GDP per capita/Country GDP per capita = 5,67
Political factor = 0,3
Crisis factor = 0,1
Other unique factors = 2 (Always close co civil war due to religious and ethnic problems)

OVERALL CREDIT SCORE: 0,474 (47,4%). This responds to D.

Calculated with this (new) formula:

r = 10/{[1+(debt/GDP)] + [1+10*(accumulated deficit for last 5 years/budget income for last 5 years)] + [1 + (10/years since last default)] + [1+3*(accumulated of last 5 years inflation)] + [1+(budget expences/GDP)] + [1+ 10* (trade deficit/GDP)] + [world's GDP per capita/country's GDP per capita] + [1+political factor] + [1+crisis factor] + [Other unique factors]}

Interesting sites: Добри Божилов