| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 0.803296 |
| 2021 | 0.811534 |
| 2020 | 0.82694 |
| 2019 | 0.843895 |
| 2018 | 0.859291 |
| 2017 | 0.866651 |
| 2016 | 0.866657 |
| 2015 | 0.863619 |
| 2014 | 0.859944 |
| 2013 | 0.857245 |
| 2012 | 0.855886 |
| 2011 | 0.855225 |
| 2010 | 0.85454 |
| 2009 | 0.853403 |
| 2008 | 0.851613 |
| 2007 | 0.849492 |
| 2006 | 0.847677 |
| 2005 | 0.84673 |
| 2004 | 0.846739 |
| 2003 | 0.847297 |
| 2002 | 0.848473 |
| 2001 | 0.850103 |
| 2000 | 0.851895 |
| 1999 | 0.854321 |
| 1998 | 0.857499 |
| 1997 | 0.861471 |
| 1996 | 0.866045 |
| 1995 | 0.870574 |
| 1994 | 0.874883 |
| 1993 | 0.878601 |
| 1992 | 0.881451 |
| 1991 | 0.882994 |
| 1990 | 0.883013 |
| 1989 | 0.881623 |
| 1988 | 0.878417 |
| 1987 | 0.87413 |
| 1986 | 0.870095 |
| 1985 | 0.867139 |
| 1984 | 0.865375 |
| 1983 | 0.865598 |
| 1982 | 0.867367 |
| 1981 | 0.868653 |
| 1980 | 0.869253 |
| 1979 | 0.869056 |
| 1978 | 0.866817 |
| 1977 | 0.863444 |
| 1976 | 0.861337 |
| 1975 | 0.862994 |
| 1974 | 0.869146 |
| 1973 | 0.879535 |
| 1972 | 0.893111 |
| 1971 | 0.906313 |
| 1970 | 0.916131 |
| 1969 | 0.922306 |
| 1968 | 0.924448 |
| 1967 | 0.923151 |
| 1966 | 0.919378 |
| 1965 | 0.914161 |
| 1964 | 0.908422 |
| 1963 | 0.900811 |
| 1962 | 0.891843 |
| 1961 | 0.881973 |
| 1960 | 0.871461 |