| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 0.349947 |
| 2021 | 0.350913 |
| 2020 | 0.354065 |
| 2019 | 0.353882 |
| 2018 | 0.352071 |
| 2017 | 0.350396 |
| 2016 | 0.349205 |
| 2015 | 0.348399 |
| 2014 | 0.347642 |
| 2013 | 0.347074 |
| 2012 | 0.346897 |
| 2011 | 0.347031 |
| 2010 | 0.347536 |
| 2009 | 0.348372 |
| 2008 | 0.349599 |
| 2007 | 0.350884 |
| 2006 | 0.351761 |
| 2005 | 0.352569 |
| 2004 | 0.353545 |
| 2003 | 0.354577 |
| 2002 | 0.355582 |
| 2001 | 0.356593 |
| 2000 | 0.357462 |
| 1999 | 0.358381 |
| 1998 | 0.359678 |
| 1997 | 0.360934 |
| 1996 | 0.361823 |
| 1995 | 0.362823 |
| 1994 | 0.364056 |
| 1993 | 0.364938 |
| 1992 | 0.365581 |
| 1991 | 0.366187 |
| 1990 | 0.366254 |
| 1989 | 0.365891 |
| 1988 | 0.365437 |
| 1987 | 0.365311 |
| 1986 | 0.365942 |
| 1985 | 0.366867 |
| 1984 | 0.367759 |
| 1983 | 0.369314 |
| 1982 | 0.37117 |
| 1981 | 0.372601 |
| 1980 | 0.372929 |
| 1979 | 0.371709 |
| 1978 | 0.368512 |
| 1977 | 0.363598 |
| 1976 | 0.358426 |
| 1975 | 0.354191 |
| 1974 | 0.35079 |
| 1973 | 0.347352 |
| 1972 | 0.343769 |
| 1971 | 0.340228 |
| 1970 | 0.336978 |
| 1969 | 0.333926 |
| 1968 | 0.330889 |
| 1967 | 0.328557 |
| 1966 | 0.326489 |
| 1965 | 0.323895 |
| 1964 | 0.321269 |
| 1963 | 0.318924 |
| 1962 | 0.316917 |
| 1961 | 0.314751 |
| 1960 | 0.312327 |