| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 5.51026 |
| 2021 | 5.54902 |
| 2020 | 5.61268 |
| 2019 | 5.64945 |
| 2018 | 5.6685 |
| 2017 | 5.6934 |
| 2016 | 5.72143 |
| 2015 | 5.74647 |
| 2014 | 5.78561 |
| 2013 | 5.82957 |
| 2012 | 5.84934 |
| 2011 | 5.85182 |
| 2010 | 5.84778 |
| 2009 | 5.83987 |
| 2008 | 5.83116 |
| 2007 | 5.82397 |
| 2006 | 5.81629 |
| 2005 | 5.80902 |
| 2004 | 5.80546 |
| 2003 | 5.80269 |
| 2002 | 5.80066 |
| 2001 | 5.80427 |
| 2000 | 5.81408 |
| 1999 | 5.83272 |
| 1998 | 5.86298 |
| 1997 | 5.90136 |
| 1996 | 5.94194 |
| 1995 | 5.9839 |
| 1994 | 6.02849 |
| 1993 | 6.07018 |
| 1992 | 6.10574 |
| 1991 | 6.13448 |
| 1990 | 6.1574 |
| 1989 | 6.17518 |
| 1988 | 6.18483 |
| 1987 | 6.18868 |
| 1986 | 6.18637 |
| 1985 | 6.17632 |
| 1984 | 6.15985 |
| 1983 | 6.13925 |
| 1982 | 6.1161 |
| 1981 | 6.09415 |
| 1980 | 6.07937 |
| 1979 | 6.0686 |
| 1978 | 6.05437 |
| 1977 | 6.04127 |
| 1976 | 6.02821 |
| 1975 | 6.01769 |
| 1974 | 6.01369 |
| 1973 | 6.00994 |
| 1972 | 6.00612 |
| 1971 | 6.00549 |
| 1970 | 6.01372 |
| 1969 | 6.02971 |
| 1968 | 6.04905 |
| 1967 | 6.07699 |
| 1966 | 6.10039 |
| 1965 | 6.10683 |
| 1964 | 6.09501 |
| 1963 | 6.06759 |
| 1962 | 6.03732 |
| 1961 | 6.00669 |
| 1960 | 5.97548 |