| 年份 | 尼日利亚  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 2.38001 | 
| 2021 | 2.40636 | 
| 2020 | 2.44061 | 
| 2019 | 2.4482 | 
| 2018 | 2.49664 | 
| 2017 | 2.52732 | 
| 2016 | 2.50703 | 
| 2015 | 2.54119 | 
| 2014 | 2.62812 | 
| 2013 | 2.69747 | 
| 2012 | 2.74929 | 
| 2011 | 2.76406 | 
| 2010 | 2.74438 | 
| 2009 | 2.72738 | 
| 2008 | 2.71969 | 
| 2007 | 2.70963 | 
| 2006 | 2.69593 | 
| 2005 | 2.69369 | 
| 2004 | 2.6955 | 
| 2003 | 2.69277 | 
| 2002 | 2.68289 | 
| 2001 | 2.65127 | 
| 2000 | 2.60287 | 
| 1999 | 2.54262 | 
| 1998 | 2.51603 | 
| 1997 | 2.52296 | 
| 1996 | 2.52685 | 
| 1995 | 2.55719 | 
| 1994 | 2.57483 | 
| 1993 | 2.55577 | 
| 1992 | 2.52373 | 
| 1991 | 2.5622 | 
| 1990 | 2.6286 | 
| 1989 | 2.61364 | 
| 1988 | 2.58684 | 
| 1987 | 2.5771 | 
| 1986 | 2.62007 | 
| 1985 | 2.72593 | 
| 1984 | 2.47194 | 
| 1983 | 2.50558 | 
| 1982 | 2.90087 | 
| 1981 | 3.00299 | 
| 1980 | 3.06371 | 
| 1979 | 3.03784 | 
| 1978 | 3.02292 | 
| 1977 | 2.94325 | 
| 1976 | 2.83449 | 
| 1975 | 2.73123 | 
| 1974 | 2.57126 | 
| 1973 | 2.43113 | 
| 1972 | 2.32373 | 
| 1971 | 2.25681 | 
| 1970 | 2.19879 | 
| 1969 | 2.13938 | 
| 1968 | 2.09554 | 
| 1967 | 2.10697 | 
| 1966 | 2.16856 | 
| 1965 | 2.16539 | 
| 1964 | 2.13863 | 
| 1963 | 2.11478 | 
| 1962 | 2.08546 | 
| 1961 | 2.04265 | 
| 1960 | - |