| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 15.7455 |
| 2021 | 17.3385 |
| 2020 | 15.7622 |
| 2019 | 15.6551 |
| 2018 | 15.1749 |
| 2017 | 15.4619 |
| 2016 | 15.27 |
| 2015 | 16.4976 |
| 2014 | 17.9391 |
| 2013 | 15.2963 |
| 2012 | 15.1012 |
| 2011 | 16.3865 |
| 2010 | 15.4807 |
| 2009 | 18.3468 |
| 2008 | 17.1427 |
| 2007 | 17.2126 |
| 2006 | 16.9059 |
| 2005 | 17.7796 |
| 2004 | 19.4702 |
| 2003 | 18.4368 |
| 2002 | 18.6447 |
| 2001 | 19.149 |
| 2000 | 20.712 |
| 1999 | 21.9767 |
| 1998 | 19.9443 |
| 1997 | 20.5425 |
| 1996 | 19.8117 |
| 1995 | 19.2601 |
| 1994 | 19.5687 |
| 1993 | 21.4622 |
| 1992 | 19.8633 |
| 1991 | 19.6415 |
| 1990 | 20.9351 |
| 1989 | 15.7055 |
| 1988 | 15.5035 |
| 1987 | 11.2204 |
| 1986 | 11.2981 |
| 1985 | 10.8313 |
| 1984 | 10.2114 |
| 1983 | 11.2356 |
| 1982 | 11.3122 |
| 1981 | 10.9341 |
| 1980 | 10.3774 |
| 1979 | 11.4113 |
| 1978 | 11.6044 |
| 1977 | 14.3068 |
| 1976 | 12.9786 |
| 1975 | 10.8128 |
| 1974 | 8.16811 |
| 1973 | 8.6224 |
| 1972 | 9.30754 |
| 1971 | 8.24301 |
| 1970 | 8.67835 |
| 1969 | 8.73633 |
| 1968 | 8.47281 |
| 1967 | 8.02773 |
| 1966 | 7.08663 |
| 1965 | 6.48334 |
| 1964 | 7.3854 |
| 1963 | 7.55466 |
| 1962 | 8.56454 |
| 1961 | 9.23701 |
| 1960 | 8.0432 |