| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 4.64077 |
| 2021 | 4.6252 |
| 2020 | 4.59858 |
| 2019 | 4.56083 |
| 2018 | 4.50935 |
| 2017 | 4.44983 |
| 2016 | 4.39086 |
| 2015 | 4.33149 |
| 2014 | 4.27374 |
| 2013 | 4.22558 |
| 2012 | 4.18891 |
| 2011 | 4.16273 |
| 2010 | 4.14922 |
| 2009 | 4.14822 |
| 2008 | 4.15537 |
| 2007 | 4.16669 |
| 2006 | 4.17782 |
| 2005 | 4.18614 |
| 2004 | 4.19065 |
| 2003 | 4.19269 |
| 2002 | 4.19408 |
| 2001 | 4.19572 |
| 2000 | 4.1989 |
| 1999 | 4.20199 |
| 1998 | 4.20243 |
| 1997 | 4.19969 |
| 1996 | 4.19691 |
| 1995 | 4.19475 |
| 1994 | 4.17773 |
| 1993 | 4.15972 |
| 1992 | 4.17913 |
| 1991 | 4.23118 |
| 1990 | 4.29631 |
| 1989 | 4.38518 |
| 1988 | 4.47839 |
| 1987 | 4.52981 |
| 1986 | 4.54685 |
| 1985 | 4.55303 |
| 1984 | 4.55772 |
| 1983 | 4.56888 |
| 1982 | 4.58684 |
| 1981 | 4.60574 |
| 1980 | 4.62187 |
| 1979 | 4.63527 |
| 1978 | 4.64633 |
| 1977 | 4.65398 |
| 1976 | 4.66215 |
| 1975 | 4.67396 |
| 1974 | 4.68692 |
| 1973 | 4.69858 |
| 1972 | 4.70966 |
| 1971 | 4.72132 |
| 1970 | 4.73265 |
| 1969 | 4.74428 |
| 1968 | 4.75675 |
| 1967 | 4.76786 |
| 1966 | 4.77618 |
| 1965 | 4.78083 |
| 1964 | 4.78277 |
| 1963 | 4.783 |
| 1962 | 4.77974 |
| 1961 | 4.77009 |
| 1960 | 4.75296 |