| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 2.91445 |
| 2021 | 2.88852 |
| 2020 | 2.87267 |
| 2019 | 2.86441 |
| 2018 | 2.86101 |
| 2017 | 2.86174 |
| 2016 | 2.86427 |
| 2015 | 2.86626 |
| 2014 | 2.86779 |
| 2013 | 2.86999 |
| 2012 | 2.87343 |
| 2011 | 2.87869 |
| 2010 | 2.88607 |
| 2009 | 2.89443 |
| 2008 | 2.90285 |
| 2007 | 2.91015 |
| 2006 | 2.91682 |
| 2005 | 2.92351 |
| 2004 | 2.91294 |
| 2003 | 2.89708 |
| 2002 | 2.90356 |
| 2001 | 2.92366 |
| 2000 | 2.94952 |
| 1999 | 2.99878 |
| 1998 | 3.05395 |
| 1997 | 3.08126 |
| 1996 | 3.0917 |
| 1995 | 3.09524 |
| 1994 | 3.09738 |
| 1993 | 3.10133 |
| 1992 | 3.10743 |
| 1991 | 3.1135 |
| 1990 | 3.11756 |
| 1989 | 3.11966 |
| 1988 | 3.11912 |
| 1987 | 3.11692 |
| 1986 | 3.11692 |
| 1985 | 3.12123 |
| 1984 | 3.12891 |
| 1983 | 3.13857 |
| 1982 | 3.15023 |
| 1981 | 3.16414 |
| 1980 | 3.18068 |
| 1979 | 3.19947 |
| 1978 | 3.21939 |
| 1977 | 3.23958 |
| 1976 | 3.25876 |
| 1975 | 3.27659 |
| 1974 | 3.29277 |
| 1973 | 3.30607 |
| 1972 | 3.31572 |
| 1971 | 3.32096 |
| 1970 | 3.3214 |
| 1969 | 3.31758 |
| 1968 | 3.30935 |
| 1967 | 3.29883 |
| 1966 | 3.29063 |
| 1965 | 3.28732 |
| 1964 | 3.28867 |
| 1963 | 3.2953 |
| 1962 | 3.30643 |
| 1961 | 3.3174 |
| 1960 | 3.32576 |