| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | 2.24147 |
| 2021 | 2.23856 |
| 2020 | 2.23714 |
| 2019 | 2.23222 |
| 2018 | 2.2252 |
| 2017 | 2.21873 |
| 2016 | 2.21356 |
| 2015 | 2.21014 |
| 2014 | 2.20821 |
| 2013 | 2.20705 |
| 2012 | 2.20591 |
| 2011 | 2.20534 |
| 2010 | 2.20529 |
| 2009 | 2.19834 |
| 2008 | 2.19146 |
| 2007 | 2.20374 |
| 2006 | 2.23254 |
| 2005 | 2.2689 |
| 2004 | 2.3189 |
| 2003 | 2.37157 |
| 2002 | 2.40203 |
| 2001 | 2.41287 |
| 2000 | 2.41607 |
| 1999 | 2.41713 |
| 1998 | 2.41954 |
| 1997 | 2.4246 |
| 1996 | 2.4311 |
| 1995 | 2.43682 |
| 1994 | 2.44103 |
| 1993 | 2.4427 |
| 1992 | 2.44212 |
| 1991 | 2.44186 |
| 1990 | 2.44343 |
| 1989 | 2.44623 |
| 1988 | 2.44924 |
| 1987 | 2.45322 |
| 1986 | 2.45892 |
| 1985 | 2.4667 |
| 1984 | 2.47646 |
| 1983 | 2.48757 |
| 1982 | 2.49925 |
| 1981 | 2.51089 |
| 1980 | 2.52229 |
| 1979 | 2.53309 |
| 1978 | 2.54269 |
| 1977 | 2.55014 |
| 1976 | 2.55358 |
| 1975 | 2.55268 |
| 1974 | 2.54745 |
| 1973 | 2.53617 |
| 1972 | 2.52059 |
| 1971 | 2.50573 |
| 1970 | 2.49439 |
| 1969 | 2.48717 |
| 1968 | 2.48541 |
| 1967 | 2.48904 |
| 1966 | 2.49255 |
| 1965 | 2.49273 |
| 1964 | 2.49156 |
| 1963 | 2.48792 |
| 1962 | 2.48377 |
| 1961 | 2.48591 |
| 1960 | 2.49945 |