| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | - |
| 2020 | - |
| 2019 | - |
| 2018 | - |
| 2017 | - |
| 2016 | - |
| 2015 | - |
| 2014 | - |
| 2013 | - |
| 2012 | - |
| 2011 | - |
| 2010 | - |
| 2009 | - |
| 2008 | - |
| 2007 | - |
| 2006 | - |
| 2005 | - |
| 2004 | - |
| 2003 | - |
| 2002 | - |
| 2001 | - |
| 2000 | - |
| 1999 | - |
| 1998 | 0.0929634 |
| 1997 | 0.096532 |
| 1996 | 0.100107 |
| 1995 | 0.103683 |
| 1994 | 0.115518 |
| 1993 | 0.119359 |
| 1992 | 0.1232 |
| 1991 | 0.136454 |
| 1990 | 0.154041 |
| 1989 | 0.181363 |
| 1988 | 0.170724 |
| 1987 | 0.166281 |
| 1986 | 0.16172 |
| 1985 | 0.153531 |
| 1984 | 0.143266 |
| 1983 | 0.127974 |
| 1982 | 0.122818 |
| 1981 | 0.10745 |
| 1980 | 0.0940071 |
| 1979 | 0.0753617 |
| 1978 | 0.0767342 |
| 1977 | 0.0767342 |
| 1976 | 0.0757111 |
| 1975 | 0.0695581 |
| 1974 | 0.0664894 |
| 1973 | 0.0573543 |
| 1972 | 0.0545959 |
| 1971 | 0.0534474 |
| 1970 | 0.0419755 |
| 1969 | 0.0115009 |
| 1968 | 0.011499 |
| 1967 | 0.0104366 |
| 1966 | 0.00956688 |
| 1965 | 0.00956688 |
| 1964 | 0.00782677 |
| 1963 | 0.00608749 |
| 1962 | 0.00521785 |
| 1961 | 0.0043482 |
| 1960 | - |