Annee	Cameroun	Rep.CentrAfrique	Tchad	Rep.Congo	Guinee.Equatoriale	Gabon	Nigeria
1960	41.75	38.66	40.97	48.49	36.88	39.88	38.73
1962	42.63	39.46	41.70	49.82	37.48	40.48	39.35
1967	44.80	41.45	43.59	52.88	38.98	44.59	41.04
1970	46.15	42.63	44.77	54.65	39.89	47.05	42.11
1972	47.06	43.42	45.56	55.83	40.50	48.69	42.82
1977	49.37	46.75	47.38	58.5	41.99	52.34	44.52
1980	51.54	47.66	48.66	59.51	42.99	54.81	45.31
1982	52.99	48.27	49.52	60.18	43.66	56.46	45.83
1985	54.21	49.59	50.43	60.10	44.87	58.74	46.47
1987	55.02	50.46	51.05	60.04	45.67	60.27	46.89
1990	54.61	49.81	51.45	58.76	46.85	60.86	47.24
1992	54.35	49.38	51.72	57.91	47.64	61.25	47.48
1995	53.04	47.37	51.62	55.79	48.27	61.01	47.46
1997	52.17	46.02	51.55	54.38	48.69	60.84	47.44
2000	50.77	44.36	50.92	53.72	48.74	59.84	46.93
2002	49.83	43.25	50.50	53.29	48.78	59.17	46.59
2005	50.17	44.10	50.57	53.43	49.54	59.85	46.73
2006	50.28	44.38	50.60	53.48	49.80	60.08	46.78
2007	50.40	44.67	50.62	53.53	50.05	60.30	46.83
2008	50.51	44.95	50.65	53.72	50.46	60.73	46.89