| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 2.85258 |
| 2021 | 2.8255 |
| 2020 | 2.80846 |
| 2019 | 2.79816 |
| 2018 | 2.7924 |
| 2017 | 2.79032 |
| 2016 | 2.78921 |
| 2015 | 2.78687 |
| 2014 | 2.78347 |
| 2013 | 2.78001 |
| 2012 | 2.77757 |
| 2011 | 2.77727 |
| 2010 | 2.77956 |
| 2009 | 2.78342 |
| 2008 | 2.78763 |
| 2007 | 2.79059 |
| 2006 | 2.79269 |
| 2005 | 2.79453 |
| 2004 | 2.78683 |
| 2003 | 2.77868 |
| 2002 | 2.79505 |
| 2001 | 2.83241 |
| 2000 | 2.87865 |
| 1999 | 2.94094 |
| 1998 | 3.00507 |
| 1997 | 3.04054 |
| 1996 | 3.0523 |
| 1995 | 3.05576 |
| 1994 | 3.05728 |
| 1993 | 3.06077 |
| 1992 | 3.06685 |
| 1991 | 3.07322 |
| 1990 | 3.07761 |
| 1989 | 3.07993 |
| 1988 | 3.07955 |
| 1987 | 3.07721 |
| 1986 | 3.07661 |
| 1985 | 3.07993 |
| 1984 | 3.08634 |
| 1983 | 3.09486 |
| 1982 | 3.10574 |
| 1981 | 3.11894 |
| 1980 | 3.13461 |
| 1979 | 3.15209 |
| 1978 | 3.17009 |
| 1977 | 3.18726 |
| 1976 | 3.20229 |
| 1975 | 3.21511 |
| 1974 | 3.22554 |
| 1973 | 3.23267 |
| 1972 | 3.23582 |
| 1971 | 3.23395 |
| 1970 | 3.22624 |
| 1969 | 3.21345 |
| 1968 | 3.1955 |
| 1967 | 3.17476 |
| 1966 | 3.15604 |
| 1965 | 3.142 |
| 1964 | 3.13338 |
| 1963 | 3.13123 |
| 1962 | 3.13439 |
| 1961 | 3.13697 |
| 1960 | 3.13588 |