| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 6.82 |
| 2020 | 6.892 |
| 2019 | 6.961 |
| 2018 | 7.023 |
| 2017 | 7.084 |
| 2016 | 7.141 |
| 2015 | 7.211 |
| 2014 | 7.279 |
| 2013 | 7.344 |
| 2012 | 7.4 |
| 2011 | 7.449 |
| 2010 | 7.485 |
| 2009 | 7.513 |
| 2008 | 7.539 |
| 2007 | 7.559 |
| 2006 | 7.579 |
| 2005 | 7.615 |
| 2004 | 7.634 |
| 2003 | 7.654 |
| 2002 | 7.671 |
| 2001 | 7.695 |
| 2000 | 7.732 |
| 1999 | 7.752 |
| 1998 | 7.762 |
| 1997 | 7.759 |
| 1996 | 7.762 |
| 1995 | 7.776 |
| 1994 | 7.786 |
| 1993 | 7.79 |
| 1992 | 7.795 |
| 1991 | 7.798 |
| 1990 | 7.806 |
| 1989 | 7.818 |
| 1988 | 7.841 |
| 1987 | 7.871 |
| 1986 | 7.904 |
| 1985 | 7.932 |
| 1984 | 7.921 |
| 1983 | 7.902 |
| 1982 | 7.862 |
| 1981 | 7.822 |
| 1980 | 7.782 |
| 1979 | 7.722 |
| 1978 | 7.662 |
| 1977 | 7.595 |
| 1976 | 7.563 |
| 1975 | 7.539 |
| 1974 | 7.539 |
| 1973 | 7.529 |
| 1972 | 7.523 |
| 1971 | 7.518 |
| 1970 | 7.514 |
| 1969 | 7.506 |
| 1968 | 7.497 |
| 1967 | 7.49 |
| 1966 | 7.481 |
| 1965 | 7.466 |
| 1964 | 7.48 |
| 1963 | 7.489 |
| 1962 | 7.501 |
| 1961 | 7.512 |
| 1960 | 7.53 |