| 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 | - |