| 年份 | 尼日尔  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 3.22十万 | 
| 2021 | 3十万 | 
| 2020 | 3.07十万 | 
| 2019 | 3.08十万 | 
| 2018 | 3.02十万 | 
| 2017 | 2.92十万 | 
| 2016 | 2.89十万 | 
| 2015 | 2.84十万 | 
| 2014 | 2.83十万 | 
| 2013 | 2.76十万 | 
| 2012 | 2.72十万 | 
| 2011 | 2.56十万 | 
| 2010 | 2.59十万 | 
| 2009 | 2.48十万 | 
| 2008 | 2.52十万 | 
| 2007 | 2.43十万 | 
| 2006 | 2.44十万 | 
| 2005 | 2.39十万 | 
| 2004 | 2.31十万 | 
| 2003 | 2.38十万 | 
| 2002 | 2.42十万 | 
| 2001 | 2.38十万 | 
| 2000 | 2.3十万 | 
| 1999 | 2.41十万 | 
| 1998 | 2.5十万 | 
| 1997 | 2.35十万 | 
| 1996 | 2.39十万 | 
| 1995 | 2.47十万 | 
| 1994 | 2.49十万 | 
| 1993 | 2.53十万 | 
| 1992 | 2.6十万 | 
| 1991 | 2.63十万 | 
| 1990 | 2.73十万 | 
| 1989 | 2.85十万 | 
| 1988 | 2.91十万 | 
| 1987 | 2.81十万 | 
| 1986 | 2.89十万 | 
| 1985 | 2.8十万 | 
| 1984 | 2.68十万 | 
| 1983 | 3.32十万 | 
| 1982 | 3.56十万 | 
| 1981 | 3.59十万 | 
| 1980 | 3.71十万 | 
| 1979 | 3.92十万 | 
| 1978 | 3.77十万 | 
| 1977 | 3.42十万 | 
| 1976 | 3.27十万 | 
| 1975 | 3.34十万 | 
| 1974 | 3.53十万 | 
| 1973 | 3.33十万 | 
| 1972 | 4.12十万 | 
| 1971 | 4.46十万 | 
| 1970 | 4.34十万 | 
| 1969 | 4.33十万 | 
| 1968 | 4.71十万 | 
| 1967 | 4.83十万 | 
| 1966 | 4.96十万 | 
| 1965 | 5.13十万 | 
| 1964 | 4.94十万 | 
| 1963 | 5.08十万 | 
| 1962 | 4.78十万 | 
| 1961 | 4.46十万 | 
| 1960 | 4.4十万 |