| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 3.83862 |
| 2021 | 3.91159 |
| 2020 | 3.99425 |
| 2019 | 4.05019 |
| 2018 | 4.14895 |
| 2017 | 4.22997 |
| 2016 | 4.25799 |
| 2015 | 4.34676 |
| 2014 | 4.48425 |
| 2013 | 4.60638 |
| 2012 | 4.71337 |
| 2011 | 4.7813 |
| 2010 | 4.81723 |
| 2009 | 4.82973 |
| 2008 | 4.85983 |
| 2007 | 4.87905 |
| 2006 | 4.89554 |
| 2005 | 4.92446 |
| 2004 | 4.96111 |
| 2003 | 4.98898 |
| 2002 | 5.00783 |
| 2001 | 5.00285 |
| 2000 | 4.15329 |
| 1999 | 4.10265 |
| 1998 | 4.08575 |
| 1997 | 4.10549 |
| 1996 | 4.12861 |
| 1995 | 4.16609 |
| 1994 | 4.194 |
| 1993 | 4.18855 |
| 1992 | 4.17036 |
| 1991 | 4.21955 |
| 1990 | 5.49267 |
| 1989 | 5.50862 |
| 1988 | 5.52035 |
| 1987 | 5.54247 |
| 1986 | 5.61363 |
| 1985 | 5.74752 |
| 1984 | 5.53377 |
| 1983 | 5.59143 |
| 1982 | 6.0188 |
| 1981 | 6.14386 |
| 1980 | 5.14252 |
| 1979 | 5.12281 |
| 1978 | 5.12322 |
| 1977 | 5.05395 |
| 1976 | 4.96037 |
| 1975 | 4.86196 |
| 1974 | 4.71672 |
| 1973 | 4.58049 |
| 1972 | 4.49276 |
| 1971 | 4.4345 |
| 1970 | 3.59931 |
| 1969 | 3.54243 |
| 1968 | 3.5068 |
| 1967 | 3.52057 |
| 1966 | 3.59034 |
| 1965 | 3.58317 |
| 1964 | 3.56435 |
| 1963 | 3.54853 |
| 1962 | 3.51446 |
| 1961 | 3.47938 |
| 1960 | - |