| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 0.487194 |
| 2021 | 0.489339 |
| 2020 | 0.492422 |
| 2019 | 0.491264 |
| 2018 | 0.488131 |
| 2017 | 0.485802 |
| 2016 | 0.483828 |
| 2015 | 0.48162 |
| 2014 | 0.4792 |
| 2013 | 0.476473 |
| 2012 | 0.473582 |
| 2011 | 0.47102 |
| 2010 | 0.469103 |
| 2009 | 0.467574 |
| 2008 | 0.466282 |
| 2007 | 0.46539 |
| 2006 | 0.464709 |
| 2005 | 0.46433 |
| 2004 | 0.464547 |
| 2003 | 0.465155 |
| 2002 | 0.465988 |
| 2001 | 0.466766 |
| 2000 | 0.467265 |
| 1999 | 0.467992 |
| 1998 | 0.469347 |
| 1997 | 0.471351 |
| 1996 | 0.473639 |
| 1995 | 0.475639 |
| 1994 | 0.477001 |
| 1993 | 0.477155 |
| 1992 | 0.476378 |
| 1991 | 0.475423 |
| 1990 | 0.474596 |
| 1989 | 0.474002 |
| 1988 | 0.473988 |
| 1987 | 0.474792 |
| 1986 | 0.475465 |
| 1985 | 0.475348 |
| 1984 | 0.474558 |
| 1983 | 0.473176 |
| 1982 | 0.471442 |
| 1981 | 0.470322 |
| 1980 | 0.4712 |
| 1979 | 0.474153 |
| 1978 | 0.478974 |
| 1977 | 0.485186 |
| 1976 | 0.49081 |
| 1975 | 0.494537 |
| 1974 | 0.496152 |
| 1973 | 0.494935 |
| 1972 | 0.490874 |
| 1971 | 0.485666 |
| 1970 | 0.480563 |
| 1969 | 0.47544 |
| 1968 | 0.469785 |
| 1967 | 0.464511 |
| 1966 | 0.458648 |
| 1965 | 0.451834 |
| 1964 | 0.445479 |
| 1963 | 0.439392 |
| 1962 | 0.433437 |
| 1961 | 0.427383 |
| 1960 | 0.421046 |