| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 12.7319 |
| 2021 | 12.7288 |
| 2020 | 12.7058 |
| 2019 | 12.6689 |
| 2018 | 12.6183 |
| 2017 | 12.5695 |
| 2016 | 12.5171 |
| 2015 | 12.4467 |
| 2014 | 12.3627 |
| 2013 | 12.262 |
| 2012 | 12.1567 |
| 2011 | 12.0744 |
| 2010 | 12.0181 |
| 2009 | 11.9865 |
| 2008 | 11.9825 |
| 2007 | 11.9844 |
| 2006 | 11.97 |
| 2005 | 11.9465 |
| 2004 | 11.929 |
| 2003 | 11.9202 |
| 2002 | 11.9261 |
| 2001 | 11.9597 |
| 2000 | 12.0212 |
| 1999 | 12.1062 |
| 1998 | 12.2221 |
| 1997 | 12.3569 |
| 1996 | 12.4831 |
| 1995 | 12.5888 |
| 1994 | 12.6686 |
| 1993 | 12.7143 |
| 1992 | 12.7211 |
| 1991 | 12.6883 |
| 1990 | 12.6249 |
| 1989 | 12.5327 |
| 1988 | 12.3939 |
| 1987 | 12.2261 |
| 1986 | 12.0546 |
| 1985 | 11.8809 |
| 1984 | 11.7194 |
| 1983 | 11.5882 |
| 1982 | 11.49 |
| 1981 | 11.4248 |
| 1980 | 11.4002 |
| 1979 | 11.4113 |
| 1978 | 11.4393 |
| 1977 | 11.4763 |
| 1976 | 11.5049 |
| 1975 | 11.5147 |
| 1974 | 11.5062 |
| 1973 | 11.478 |
| 1972 | 11.4368 |
| 1971 | 11.392 |
| 1970 | 11.3514 |
| 1969 | 11.3109 |
| 1968 | 11.2675 |
| 1967 | 11.2216 |
| 1966 | 11.1847 |
| 1965 | 11.1616 |
| 1964 | 11.1028 |
| 1963 | 11.0466 |
| 1962 | 11.0982 |
| 1961 | 11.2382 |
| 1960 | 11.4106 |