| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 6.24675 |
| 2020 | 3.31242 |
| 2019 | 6.51475 |
| 2018 | 7.69068 |
| 2017 | 5.47263 |
| 2016 | 2.68429 |
| 2015 | 2.78345 |
| 2014 | 7.07386 |
| 2013 | 9.88011 |
| 2012 | 13.0905 |
| 2011 | 15.5113 |
| 2010 | 12.0986 |
| 2009 | 8.67399 |
| 2008 | 15.5299 |
| 2007 | 13.8344 |
| 2006 | 14.8804 |
| 2005 | 17.6958 |
| 2004 | 14.4183 |
| 2003 | 12.1202 |
| 2002 | 11.1446 |
| 2001 | 15.2355 |
| 2000 | 22.0499 |
| 1999 | 10.1094 |
| 1998 | 7.0976 |
| 1997 | 14.5385 |
| 1996 | 16.7094 |
| 1995 | 16.2953 |
| 1994 | 18.699 |
| 1993 | 28.7054 |
| 1992 | 17.3838 |
| 1991 | 14.3917 |
| 1990 | 21.9637 |
| 1989 | 19.9071 |
| 1988 | 7.85121 |
| 1987 | 8.76377 |
| 1986 | 4.2393 |
| 1985 | 9.36777 |
| 1984 | 8.00296 |
| 1983 | 4.6223 |
| 1982 | 1.57388 |
| 1981 | 3.90947 |
| 1980 | 24.7025 |
| 1979 | 40.9068 |
| 1978 | 16.4071 |
| 1977 | 20.4123 |
| 1976 | 16.2579 |
| 1975 | 18.2646 |
| 1974 | 26.9908 |
| 1973 | 2.79133 |
| 1972 | 1.7354 |
| 1971 | 0.570453 |
| 1970 | 0.744584 |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |