| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | - |
| 2020 | - |
| 2019 | - |
| 2018 | - |
| 2017 | 23.7855 |
| 2016 | 22.6566 |
| 2015 | 19.6421 |
| 2014 | 17.7693 |
| 2013 | 15.8474 |
| 2012 | 14.6893 |
| 2011 | 13.5427 |
| 2010 | 12.6883 |
| 2009 | 11.1009 |
| 2008 | 10.569 |
| 2007 | 10.2083 |
| 2006 | 10.5753 |
| 2005 | 9.15985 |
| 2004 | 8.24115 |
| 2003 | 6.76632 |
| 2002 | 6.17638 |
| 2001 | 6.11352 |
| 2000 | 6.17179 |
| 1999 | 6.26581 |
| 1998 | 6.08886 |
| 1997 | 6.20144 |
| 1996 | 6.07421 |
| 1995 | - |
| 1994 | - |
| 1993 | 5.85685 |
| 1992 | 5.83911 |
| 1991 | 6.03282 |
| 1990 | 5.54964 |
| 1989 | 5.51191 |
| 1988 | 5.04235 |
| 1987 | - |
| 1986 | - |
| 1985 | - |
| 1984 | 4.48175 |
| 1983 | 4.37894 |
| 1982 | 4.44745 |
| 1981 | 3.94904 |
| 1980 | 3.40356 |
| 1979 | 2.90558 |
| 1978 | 2.44512 |
| 1977 | 2.04045 |
| 1976 | 1.67648 |
| 1975 | 1.47033 |
| 1974 | 1.36217 |
| 1973 | 1.16742 |
| 1972 | 1.03519 |
| 1971 | 0.93497 |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |