| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 8.96487 |
| 2021 | 8.86865 |
| 2020 | 8.78961 |
| 2019 | 8.73576 |
| 2018 | 8.70991 |
| 2017 | 8.68869 |
| 2016 | 8.65867 |
| 2015 | 8.63065 |
| 2014 | 8.61047 |
| 2013 | 8.5949 |
| 2012 | 8.59036 |
| 2011 | 8.60908 |
| 2010 | 8.65377 |
| 2009 | 8.72448 |
| 2008 | 8.82655 |
| 2007 | 8.94571 |
| 2006 | 9.0597 |
| 2005 | 9.16137 |
| 2004 | 9.23964 |
| 2003 | 9.29006 |
| 2002 | 9.31411 |
| 2001 | 9.30995 |
| 2000 | 9.27885 |
| 1999 | 9.21769 |
| 1998 | 9.1171 |
| 1997 | 8.99328 |
| 1996 | 8.8687 |
| 1995 | 8.74155 |
| 1994 | 8.61193 |
| 1993 | 8.49822 |
| 1992 | 8.40652 |
| 1991 | 8.33575 |
| 1990 | 8.28495 |
| 1989 | 8.25202 |
| 1988 | 8.2364 |
| 1987 | 8.23355 |
| 1986 | 8.23981 |
| 1985 | 8.24717 |
| 1984 | 8.24909 |
| 1983 | 8.25543 |
| 1982 | 8.26655 |
| 1981 | 8.27529 |
| 1980 | 8.28174 |
| 1979 | 8.2873 |
| 1978 | 8.29803 |
| 1977 | 8.30393 |
| 1976 | 8.30801 |
| 1975 | 8.31301 |
| 1974 | 8.28684 |
| 1973 | 8.26214 |
| 1972 | 8.31702 |
| 1971 | 8.43941 |
| 1970 | 8.58503 |
| 1969 | 8.77811 |
| 1968 | 8.98049 |
| 1967 | 9.09128 |
| 1966 | 9.12008 |
| 1965 | 9.11292 |
| 1964 | 9.09477 |
| 1963 | 9.08262 |
| 1962 | 9.07723 |
| 1961 | 9.07046 |
| 1960 | 9.05656 |