| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 85.2507 |
| 2021 | 86.1076 |
| 2020 | 86.9313 |
| 2019 | 87.6805 |
| 2018 | 88.3349 |
| 2017 | 88.9686 |
| 2016 | 89.5183 |
| 2015 | 89.8968 |
| 2014 | 90.1523 |
| 2013 | 90.2797 |
| 2012 | 90.2518 |
| 2011 | 90.1299 |
| 2010 | 89.9441 |
| 2009 | 89.6743 |
| 2008 | 89.3166 |
| 2007 | 88.9225 |
| 2006 | 88.5156 |
| 2005 | 88.1012 |
| 2004 | 87.7421 |
| 2003 | 87.4156 |
| 2002 | 87.1106 |
| 2001 | 86.9198 |
| 2000 | 86.8835 |
| 1999 | 87.0398 |
| 1998 | 87.4318 |
| 1997 | 87.9695 |
| 1996 | 88.5248 |
| 1995 | 89.0915 |
| 1994 | 89.7211 |
| 1993 | 90.4062 |
| 1992 | 91.0659 |
| 1991 | 91.6282 |
| 1990 | 92.1491 |
| 1989 | 92.6177 |
| 1988 | 92.9277 |
| 1987 | 93.0701 |
| 1986 | 93.0003 |
| 1985 | 92.7053 |
| 1984 | 92.247 |
| 1983 | 91.5918 |
| 1982 | 90.827 |
| 1981 | 90.0929 |
| 1980 | 89.4251 |
| 1979 | 88.7862 |
| 1978 | 88.0801 |
| 1977 | 87.405 |
| 1976 | 86.7488 |
| 1975 | 86.0688 |
| 1974 | 85.4136 |
| 1973 | 84.7928 |
| 1972 | 84.2202 |
| 1971 | 83.6786 |
| 1970 | 83.2286 |
| 1969 | 82.8377 |
| 1968 | 82.4226 |
| 1967 | 82.0187 |
| 1966 | 81.6171 |
| 1965 | 81.2204 |
| 1964 | 80.6397 |
| 1963 | 80.0037 |
| 1962 | 79.6798 |
| 1961 | 79.6036 |
| 1960 | 79.6366 |