| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.172782 |
| 2020 | 0.176991 |
| 2019 | 0.181363 |
| 2018 | 0.18358 |
| 2017 | 0.186877 |
| 2016 | 0.191496 |
| 2015 | 0.196184 |
| 2014 | 0.20106 |
| 2013 | 0.206231 |
| 2012 | 0.211688 |
| 2011 | 0.217395 |
| 2010 | 0.223295 |
| 2009 | 0.23546 |
| 2008 | 0.23544 |
| 2007 | 0.241716 |
| 2006 | 0.24814 |
| 2005 | 0.254693 |
| 2004 | 0.26142 |
| 2003 | 0.268322 |
| 2002 | 0.275406 |
| 2001 | 0.282602 |
| 2000 | 0.284896 |
| 1999 | 0.292408 |
| 1998 | 0.291369 |
| 1997 | 0.291763 |
| 1996 | 0.298316 |
| 1995 | 0.304101 |
| 1994 | 0.293961 |
| 1993 | 0.292871 |
| 1992 | 0.300453 |
| 1991 | 0.296872 |
| 1990 | 0.294851 |
| 1989 | 0.300698 |
| 1988 | 0.306713 |
| 1987 | 0.312139 |
| 1986 | 0.318866 |
| 1985 | 0.325572 |
| 1984 | 0.332749 |
| 1983 | 0.339224 |
| 1982 | 0.345932 |
| 1981 | 0.354145 |
| 1980 | 0.362926 |
| 1979 | 0.372126 |
| 1978 | 0.381462 |
| 1977 | 0.390962 |
| 1976 | 0.400351 |
| 1975 | 0.409522 |
| 1974 | 0.418458 |
| 1973 | 0.426874 |
| 1972 | 0.434852 |
| 1971 | 0.442489 |
| 1970 | 0.449925 |
| 1969 | 0.457223 |
| 1968 | 0.464348 |
| 1967 | 0.471341 |
| 1966 | 0.478496 |
| 1965 | 0.486021 |
| 1964 | 0.493651 |
| 1963 | 0.501249 |
| 1962 | 0.508801 |
| 1961 | 0.516317 |
| 1960 | - |