| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 0.726337 |
| 2021 | 0.752531 |
| 2020 | 0.787065 |
| 2019 | 0.797385 |
| 2018 | 0.848865 |
| 2017 | 0.884812 |
| 2016 | 0.873817 |
| 2015 | 0.913465 |
| 2014 | 1.01162 |
| 2013 | 1.09208 |
| 2012 | 1.15488 |
| 2011 | 1.18406 |
| 2010 | 1.1785 |
| 2009 | 1.19594 |
| 2008 | 1.21641 |
| 2007 | 1.24027 |
| 2006 | 1.25934 |
| 2005 | 1.28878 |
| 2004 | 1.31963 |
| 2003 | 1.34817 |
| 2002 | 1.37012 |
| 2001 | 1.37085 |
| 2000 | 1.78364 |
| 1999 | 1.7376 |
| 1998 | 1.72493 |
| 1997 | 1.74402 |
| 1996 | 1.75688 |
| 1995 | 1.80188 |
| 1994 | 1.83245 |
| 1993 | 1.82463 |
| 1992 | 1.80362 |
| 1991 | 1.85435 |
| 1990 | 1.44395 |
| 1989 | 1.4637 |
| 1988 | 1.46783 |
| 1987 | 1.49086 |
| 1986 | 1.56701 |
| 1985 | 1.70513 |
| 1984 | 1.47859 |
| 1983 | 1.54419 |
| 1982 | 1.96803 |
| 1981 | 2.10056 |
| 1980 | 2.48612 |
| 1979 | 2.4737 |
| 1978 | 2.46951 |
| 1977 | 2.40166 |
| 1976 | 2.30329 |
| 1975 | 2.21275 |
| 1974 | 2.06286 |
| 1973 | 1.93512 |
| 1972 | 1.83629 |
| 1971 | 1.78024 |
| 1970 | 1.8989 |
| 1969 | 1.84401 |
| 1968 | 1.80346 |
| 1967 | 1.81933 |
| 1966 | 1.88415 |
| 1965 | 1.88657 |
| 1964 | 1.86297 |
| 1963 | 1.84225 |
| 1962 | 1.81841 |
| 1961 | 1.77868 |
| 1960 | - |