| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 1.83134 |
| 2021 | 1.82925 |
| 2020 | 1.831 |
| 2019 | 1.83082 |
| 2018 | 1.82908 |
| 2017 | 1.82766 |
| 2016 | 1.82727 |
| 2015 | 1.8271 |
| 2014 | 1.81683 |
| 2013 | 1.8046 |
| 2012 | 1.80702 |
| 2011 | 1.81896 |
| 2010 | 1.8356 |
| 2009 | 1.86811 |
| 2008 | 1.90571 |
| 2007 | 1.92618 |
| 2006 | 1.93528 |
| 2005 | 1.9395 |
| 2004 | 1.94282 |
| 2003 | 1.94754 |
| 2002 | 1.95405 |
| 2001 | 1.96084 |
| 2000 | 1.96593 |
| 1999 | 1.96909 |
| 1998 | 1.97033 |
| 1997 | 1.97023 |
| 1996 | 1.97082 |
| 1995 | 1.97336 |
| 1994 | 1.97724 |
| 1993 | 1.98074 |
| 1992 | 1.98385 |
| 1991 | 1.98718 |
| 1990 | 1.99123 |
| 1989 | 1.99636 |
| 1988 | 2.00168 |
| 1987 | 2.0072 |
| 1986 | 2.01328 |
| 1985 | 2.01986 |
| 1984 | 2.02714 |
| 1983 | 2.03656 |
| 1982 | 2.04644 |
| 1981 | 2.05451 |
| 1980 | 2.06169 |
| 1979 | 2.06717 |
| 1978 | 2.06911 |
| 1977 | 2.06882 |
| 1976 | 2.06859 |
| 1975 | 2.07078 |
| 1974 | 2.07594 |
| 1973 | 2.08313 |
| 1972 | 2.09179 |
| 1971 | 2.09942 |
| 1970 | 2.10559 |
| 1969 | 2.11113 |
| 1968 | 2.11508 |
| 1967 | 2.12021 |
| 1966 | 2.13035 |
| 1965 | 2.148 |
| 1964 | 2.17403 |
| 1963 | 2.20885 |
| 1962 | 2.25027 |
| 1961 | 2.29014 |
| 1960 | 2.32185 |