| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 2.33289 |
| 2021 | 2.33245 |
| 2020 | 2.3332 |
| 2019 | 2.33172 |
| 2018 | 2.32919 |
| 2017 | 2.32735 |
| 2016 | 2.32672 |
| 2015 | 2.3275 |
| 2014 | 2.32951 |
| 2013 | 2.33259 |
| 2012 | 2.33614 |
| 2011 | 2.34063 |
| 2010 | 2.34598 |
| 2009 | 2.33799 |
| 2008 | 2.32612 |
| 2007 | 2.33194 |
| 2006 | 2.34845 |
| 2005 | 2.37008 |
| 2004 | 2.4116 |
| 2003 | 2.4591 |
| 2002 | 2.48469 |
| 2001 | 2.49624 |
| 2000 | 2.50125 |
| 1999 | 2.50422 |
| 1998 | 2.5082 |
| 1997 | 2.51397 |
| 1996 | 2.52003 |
| 1995 | 2.52471 |
| 1994 | 2.52771 |
| 1993 | 2.52806 |
| 1992 | 2.52627 |
| 1991 | 2.52524 |
| 1990 | 2.52658 |
| 1989 | 2.52953 |
| 1988 | 2.53267 |
| 1987 | 2.53655 |
| 1986 | 2.54208 |
| 1985 | 2.5496 |
| 1984 | 2.55937 |
| 1983 | 2.57116 |
| 1982 | 2.58449 |
| 1981 | 2.59905 |
| 1980 | 2.61461 |
| 1979 | 2.63068 |
| 1978 | 2.64616 |
| 1977 | 2.66022 |
| 1976 | 2.6713 |
| 1975 | 2.67906 |
| 1974 | 2.68325 |
| 1973 | 2.68192 |
| 1972 | 2.67647 |
| 1971 | 2.67136 |
| 1970 | 2.66934 |
| 1969 | 2.67068 |
| 1968 | 2.67613 |
| 1967 | 2.68587 |
| 1966 | 2.69624 |
| 1965 | 2.70494 |
| 1964 | 2.71276 |
| 1963 | 2.719 |
| 1962 | 2.72557 |
| 1961 | 2.73756 |
| 1960 | 2.75915 |