| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 10.7385 |
| 2020 | 8.11831 |
| 2019 | 14.2209 |
| 2018 | 15.4969 |
| 2017 | 13.1716 |
| 2016 | 9.21811 |
| 2015 | 10.6663 |
| 2014 | 18.4351 |
| 2013 | 18.0499 |
| 2012 | 31.5466 |
| 2011 | 31.6169 |
| 2010 | 25.6606 |
| 2009 | 18.6303 |
| 2008 | 25.6701 |
| 2007 | 21.2363 |
| 2006 | 29.5161 |
| 2005 | 21.034 |
| 2004 | 20.2538 |
| 2003 | 26.7514 |
| 2002 | 23.2397 |
| 2001 | 28.251 |
| 2000 | 36.0233 |
| 1999 | 21.3343 |
| 1998 | 18.1441 |
| 1997 | 28.6498 |
| 1996 | 23.0247 |
| 1995 | 24.1558 |
| 1994 | 13.5492 |
| 1993 | 20.0665 |
| 1992 | 23.9748 |
| 1991 | 24.2469 |
| 1990 | 20.9748 |
| 1989 | 25.2508 |
| 1988 | 11.1691 |
| 1987 | 12.8477 |
| 1986 | 5.24909 |
| 1985 | 7.09682 |
| 1984 | 6.35078 |
| 1983 | 5.53355 |
| 1982 | 6.69371 |
| 1981 | 8.59008 |
| 1980 | 29.3752 |
| 1979 | 24.8161 |
| 1978 | 19.5526 |
| 1977 | 24.8724 |
| 1976 | 18.2158 |
| 1975 | 18.3388 |
| 1974 | 25.1785 |
| 1973 | 15.9179 |
| 1972 | 10.9681 |
| 1971 | 10.8343 |
| 1970 | 8.40707 |
| 1969 | 11.3911 |
| 1968 | 9.92732 |
| 1967 | 11.0773 |
| 1966 | 10.4138 |
| 1965 | 10.8934 |
| 1964 | 9.20213 |
| 1963 | 8.77917 |
| 1962 | 8.26914 |
| 1961 | 9.18513 |
| 1960 | 9.24153 |