| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 26.5752 |
| 2021 | 27.0222 |
| 2020 | 25.7751 |
| 2019 | 26.3432 |
| 2018 | 26.2431 |
| 2017 | 26.2646 |
| 2016 | 24.3048 |
| 2015 | 30.4591 |
| 2014 | 29.7957 |
| 2013 | 29.3161 |
| 2012 | 28.9854 |
| 2011 | 34.9568 |
| 2010 | 35.7616 |
| 2009 | 34.5344 |
| 2008 | 26.5307 |
| 2007 | 22.4363 |
| 2006 | 22.6609 |
| 2005 | 23.9363 |
| 2004 | 22.7055 |
| 2003 | 20.1086 |
| 2002 | 18.9156 |
| 2001 | 19.5579 |
| 2000 | 20.3731 |
| 1999 | 18.7196 |
| 1998 | 21.0496 |
| 1997 | 19.6365 |
| 1996 | 21.2441 |
| 1995 | 20.2395 |
| 1994 | 20.5015 |
| 1993 | 15.1897 |
| 1992 | 16.925 |
| 1991 | 18.3182 |
| 1990 | 20.5481 |
| 1989 | 23.2983 |
| 1988 | 23.5886 |
| 1987 | 25.1816 |
| 1986 | 20.6919 |
| 1985 | 32.8407 |
| 1984 | 26.9704 |
| 1983 | 26.9143 |
| 1982 | 36.0975 |
| 1981 | 36.2015 |
| 1980 | 38.1261 |
| 1979 | 36.8712 |
| 1978 | 27.8287 |
| 1977 | 29.3295 |
| 1976 | 34.3378 |
| 1975 | 30.9937 |
| 1974 | 28.973 |
| 1973 | 23.735 |
| 1972 | 20.4946 |
| 1971 | 15.6011 |
| 1970 | 18.1007 |
| 1969 | 16.473 |
| 1968 | 14.3127 |
| 1967 | 14.3748 |
| 1966 | 16.0858 |
| 1965 | 14.0156 |
| 1964 | 14.0986 |
| 1963 | 10.3223 |
| 1962 | 12.9478 |
| 1961 | 9.70534 |
| 1960 | 7.40534 |