| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.0372529 |
| 2020 | 0.0197948 |
| 2019 | 0.0227924 |
| 2018 | 0.0311127 |
| 2017 | 0.0314689 |
| 2016 | 0.0268756 |
| 2015 | 0.0234772 |
| 2014 | 0.0344822 |
| 2013 | 0.0462996 |
| 2012 | 0.0645921 |
| 2011 | 0.107227 |
| 2010 | 0.0973243 |
| 2009 | 0.0396821 |
| 2008 | 0.114067 |
| 2007 | 0.0629841 |
| 2006 | 0.0550075 |
| 2005 | 0.0565882 |
| 2004 | 0.108116 |
| 2003 | 0.0312263 |
| 2002 | 0.0323125 |
| 2001 | 0.0499647 |
| 2000 | 0.0302576 |
| 1999 | 0.0195684 |
| 1998 | 0.0297276 |
| 1997 | 0.0427394 |
| 1996 | 0.0566755 |
| 1995 | 0.0638128 |
| 1994 | 0.0480932 |
| 1993 | 0.0290264 |
| 1992 | 0.0311445 |
| 1991 | 0.0421662 |
| 1990 | 0.0397681 |
| 1989 | 0.0670193 |
| 1988 | 0.0488947 |
| 1987 | 0.0415694 |
| 1986 | 0.0509755 |
| 1985 | 0.106121 |
| 1984 | 0.0926193 |
| 1983 | 0.081356 |
| 1982 | 0.0406289 |
| 1981 | 0.0242782 |
| 1980 | 0.00943002 |
| 1979 | - |
| 1978 | - |
| 1977 | - |
| 1976 | - |
| 1975 | - |
| 1974 | - |
| 1973 | - |
| 1972 | - |
| 1971 | - |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |