| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 0.542346 |
| 2021 | 0.544516 |
| 2020 | 0.546772 |
| 2019 | 0.545962 |
| 2018 | 0.54435 |
| 2017 | 0.543666 |
| 2016 | 0.543584 |
| 2015 | 0.543346 |
| 2014 | 0.542668 |
| 2013 | 0.541712 |
| 2012 | 0.540776 |
| 2011 | 0.540385 |
| 2010 | 0.540867 |
| 2009 | 0.541855 |
| 2008 | 0.543163 |
| 2007 | 0.544618 |
| 2006 | 0.54585 |
| 2005 | 0.547264 |
| 2004 | 0.549161 |
| 2003 | 0.551342 |
| 2002 | 0.553688 |
| 2001 | 0.556196 |
| 2000 | 0.558564 |
| 1999 | 0.560999 |
| 1998 | 0.563987 |
| 1997 | 0.566966 |
| 1996 | 0.569201 |
| 1995 | 0.570881 |
| 1994 | 0.572021 |
| 1993 | 0.571707 |
| 1992 | 0.57024 |
| 1991 | 0.568845 |
| 1990 | 0.567721 |
| 1989 | 0.566904 |
| 1988 | 0.5668 |
| 1987 | 0.567696 |
| 1986 | 0.569004 |
| 1985 | 0.569752 |
| 1984 | 0.569822 |
| 1983 | 0.56968 |
| 1982 | 0.569364 |
| 1981 | 0.569722 |
| 1980 | 0.57192 |
| 1979 | 0.575892 |
| 1978 | 0.5814 |
| 1977 | 0.588199 |
| 1976 | 0.595044 |
| 1975 | 0.600934 |
| 1974 | 0.605654 |
| 1973 | 0.608283 |
| 1972 | 0.608287 |
| 1971 | 0.607122 |
| 1970 | 0.606115 |
| 1969 | 0.604728 |
| 1968 | 0.602201 |
| 1967 | 0.6002 |
| 1966 | 0.598282 |
| 1965 | 0.595215 |
| 1964 | 0.591829 |
| 1963 | 0.588567 |
| 1962 | 0.585652 |
| 1961 | 0.582524 |
| 1960 | 0.579272 |