| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 0.635545 |
| 2021 | 1.0127 |
| 2020 | 0.632023 |
| 2019 | 0.459171 |
| 2018 | 0.506945 |
| 2017 | 0.430671 |
| 2016 | 0.432948 |
| 2015 | 0.417637 |
| 2014 | 0.414719 |
| 2013 | 0.469695 |
| 2012 | 0.504265 |
| 2011 | 0.579227 |
| 2010 | 0.539231 |
| 2009 | 0.505856 |
| 2008 | 0.489084 |
| 2007 | 0.370961 |
| 2006 | 0.348375 |
| 2005 | 0.397423 |
| 2004 | 0.490997 |
| 2003 | 0.570708 |
| 2002 | 0.954338 |
| 2001 | 0.780316 |
| 2000 | 0.543532 |
| 1999 | 0.855416 |
| 1998 | 0.548312 |
| 1997 | 0.435836 |
| 1996 | 0.406178 |
| 1995 | 0.483559 |
| 1994 | 0.781452 |
| 1993 | 0.933218 |
| 1992 | 0.564011 |
| 1991 | 0.773691 |
| 1990 | 0.833115 |
| 1989 | 0.579895 |
| 1988 | 0.884351 |
| 1987 | 0.769794 |
| 1986 | 1.31155 |
| 1985 | 1.43679 |
| 1984 | 1.55679 |
| 1983 | 2.21984 |
| 1982 | 2.2672 |
| 1981 | 2.77007 |
| 1980 | 3.2956 |
| 1979 | 4.32233 |
| 1978 | 5.32605 |
| 1977 | 6.02412 |
| 1976 | 5.7914 |
| 1975 | 8.12407 |
| 1974 | 4.34401 |
| 1973 | 5.47847 |
| 1972 | 5.39027 |
| 1971 | 4.39212 |
| 1970 | 5.27925 |
| 1969 | 10.317 |
| 1968 | 9.15914 |
| 1967 | 5.8082 |
| 1966 | 1.10115 |
| 1965 | 1.40145 |
| 1964 | 1.2337 |
| 1963 | 1.10319 |
| 1962 | 1.09698 |
| 1961 | 0.849453 |
| 1960 | 0.695833 |