| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 1.7184 |
| 2021 | 1.71342 |
| 2020 | 1.71371 |
| 2019 | 1.71154 |
| 2018 | 1.70648 |
| 2017 | 1.70149 |
| 2016 | 1.69717 |
| 2015 | 1.69275 |
| 2014 | 1.68305 |
| 2013 | 1.67411 |
| 2012 | 1.68043 |
| 2011 | 1.70027 |
| 2010 | 1.72657 |
| 2009 | 1.76355 |
| 2008 | 1.80276 |
| 2007 | 1.82491 |
| 2006 | 1.83181 |
| 2005 | 1.83308 |
| 2004 | 1.83349 |
| 2003 | 1.83568 |
| 2002 | 1.84004 |
| 2001 | 1.84499 |
| 2000 | 1.84853 |
| 1999 | 1.85064 |
| 1998 | 1.8512 |
| 1997 | 1.85112 |
| 1996 | 1.85251 |
| 1995 | 1.85577 |
| 1994 | 1.86037 |
| 1993 | 1.86497 |
| 1992 | 1.86942 |
| 1991 | 1.87398 |
| 1990 | 1.87943 |
| 1989 | 1.88601 |
| 1988 | 1.89215 |
| 1987 | 1.89762 |
| 1986 | 1.90243 |
| 1985 | 1.90728 |
| 1984 | 1.91266 |
| 1983 | 1.91886 |
| 1982 | 1.92434 |
| 1981 | 1.92729 |
| 1980 | 1.92846 |
| 1979 | 1.92726 |
| 1978 | 1.92195 |
| 1977 | 1.91388 |
| 1976 | 1.9052 |
| 1975 | 1.89857 |
| 1974 | 1.895 |
| 1973 | 1.89421 |
| 1972 | 1.89583 |
| 1971 | 1.89659 |
| 1970 | 1.89532 |
| 1969 | 1.89323 |
| 1968 | 1.88937 |
| 1967 | 1.88643 |
| 1966 | 1.88839 |
| 1965 | 1.89854 |
| 1964 | 1.91889 |
| 1963 | 1.94965 |
| 1962 | 1.9878 |
| 1961 | 2.02429 |
| 1960 | 2.05161 |