| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 11.8381 |
| 2020 | 8.23388 |
| 2019 | 19.803 |
| 2018 | 17.5109 |
| 2017 | 13.176 |
| 2016 | 11.5044 |
| 2015 | 10.6663 |
| 2014 | 12.4501 |
| 2013 | 12.999 |
| 2012 | 12.9858 |
| 2011 | 21.661 |
| 2010 | 17.6601 |
| 2009 | 17.4284 |
| 2008 | 15.1268 |
| 2007 | 18.1006 |
| 2006 | 13.0504 |
| 2005 | 12.0255 |
| 2004 | 11.6421 |
| 2003 | 22.5836 |
| 2002 | 16.7954 |
| 2001 | 21.4295 |
| 2000 | 12.9723 |
| 1999 | 13.1235 |
| 1998 | 21.1345 |
| 1997 | 22.8113 |
| 1996 | 17.233 |
| 1995 | 15.3726 |
| 1994 | 9.50999 |
| 1993 | 13.6532 |
| 1992 | 14.2526 |
| 1991 | 12.7747 |
| 1990 | 9.94997 |
| 1989 | 8.93184 |
| 1988 | 5.77146 |
| 1987 | 6.64768 |
| 1986 | 3.88676 |
| 1985 | 3.29516 |
| 1984 | 3.02976 |
| 1983 | 4.51142 |
| 1982 | 7.08613 |
| 1981 | 9.58164 |
| 1980 | 19.1961 |
| 1979 | 19.0623 |
| 1978 | 23.7622 |
| 1977 | 22.5229 |
| 1976 | 23.9223 |
| 1975 | 22.8316 |
| 1974 | 14.5685 |
| 1973 | 15.3498 |
| 1972 | 11.7955 |
| 1971 | 13.6294 |
| 1970 | 11.2135 |
| 1969 | 15.4301 |
| 1968 | 15.7362 |
| 1967 | 17.4111 |
| 1966 | 14.6225 |
| 1965 | 16.0173 |
| 1964 | 15.4132 |
| 1963 | 13.5373 |
| 1962 | 13.5604 |
| 1961 | 16.2999 |
| 1960 | 16.925 |