| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 1.13372 |
| 2020 | 1.08799 |
| 2019 | 0.977848 |
| 2018 | 1.12504 |
| 2017 | 1.63515 |
| 2016 | 1.48671 |
| 2015 | 1.16255 |
| 2014 | 0.995506 |
| 2013 | 1.01326 |
| 2012 | 1.09187 |
| 2011 | 1.0725 |
| 2010 | 1.06666 |
| 2009 | 1.44801 |
| 2008 | 1.3064 |
| 2007 | 1.26299 |
| 2006 | 1.08461 |
| 2005 | 1.40259 |
| 2004 | 1.6677 |
| 2003 | 2.61315 |
| 2002 | 1.95743 |
| 2001 | 2.13866 |
| 2000 | 2.32152 |
| 1999 | 2.72633 |
| 1998 | 4.09638 |
| 1997 | 3.97439 |
| 1996 | 4.4754 |
| 1995 | 5.2531 |
| 1994 | 4.87011 |
| 1993 | 5.22817 |
| 1992 | 3.35752 |
| 1991 | 3.16798 |
| 1990 | 2.98507 |
| 1989 | 2.82231 |
| 1988 | 2.42462 |
| 1987 | 2.16428 |
| 1986 | 2.075 |
| 1985 | 1.02694 |
| 1984 | 1.27129 |
| 1983 | 1.04813 |
| 1982 | 1.00182 |
| 1981 | 0.693465 |
| 1980 | 1.94355 |
| 1979 | 2.0794 |
| 1978 | 2.57549 |
| 1977 | 2.2723 |
| 1976 | 1.37787 |
| 1975 | 1.94249 |
| 1974 | 1.5045 |
| 1973 | 2.29171 |
| 1972 | 1.73325 |
| 1971 | 1.97205 |
| 1970 | 1.63674 |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |