| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 8.63568 |
| 2021 | 8.58412 |
| 2020 | 8.53034 |
| 2019 | 8.47308 |
| 2018 | 8.40993 |
| 2017 | 8.33981 |
| 2016 | 8.26213 |
| 2015 | 8.18018 |
| 2014 | 8.11179 |
| 2013 | 8.06494 |
| 2012 | 8.03405 |
| 2011 | 8.02492 |
| 2010 | 8.0465 |
| 2009 | 8.09636 |
| 2008 | 8.16242 |
| 2007 | 8.23145 |
| 2006 | 8.30707 |
| 2005 | 8.37967 |
| 2004 | 8.43255 |
| 2003 | 8.46714 |
| 2002 | 8.4789 |
| 2001 | 8.4641 |
| 2000 | 8.43544 |
| 1999 | 8.40712 |
| 1998 | 8.3863 |
| 1997 | 8.38415 |
| 1996 | 8.40065 |
| 1995 | 8.41817 |
| 1994 | 8.43977 |
| 1993 | 8.47447 |
| 1992 | 8.51953 |
| 1991 | 8.56866 |
| 1990 | 8.61571 |
| 1989 | 8.65916 |
| 1988 | 8.69827 |
| 1987 | 8.72961 |
| 1986 | 8.75084 |
| 1985 | 8.76887 |
| 1984 | 8.78739 |
| 1983 | 8.80148 |
| 1982 | 8.81132 |
| 1981 | 8.81795 |
| 1980 | 8.81899 |
| 1979 | 8.81138 |
| 1978 | 8.79516 |
| 1977 | 8.77225 |
| 1976 | 8.7411 |
| 1975 | 8.70035 |
| 1974 | 8.63031 |
| 1973 | 8.55445 |
| 1972 | 8.56995 |
| 1971 | 8.69102 |
| 1970 | 8.86351 |
| 1969 | 9.08969 |
| 1968 | 9.32935 |
| 1967 | 9.45886 |
| 1966 | 9.46143 |
| 1965 | 9.40661 |
| 1964 | 9.32707 |
| 1963 | 9.24197 |
| 1962 | 9.16115 |
| 1961 | 9.08908 |
| 1960 | 9.02546 |