| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 3.66927 |
| 2021 | 3.65974 |
| 2020 | 3.64591 |
| 2019 | 3.63323 |
| 2018 | 3.62521 |
| 2017 | 3.62585 |
| 2016 | 3.63524 |
| 2015 | 3.65064 |
| 2014 | 3.67363 |
| 2013 | 3.70512 |
| 2012 | 3.74255 |
| 2011 | 3.78469 |
| 2010 | 3.83007 |
| 2009 | 3.87623 |
| 2008 | 3.9209 |
| 2007 | 3.95992 |
| 2006 | 3.99218 |
| 2005 | 4.01944 |
| 2004 | 4.04119 |
| 2003 | 4.05697 |
| 2002 | 4.06829 |
| 2001 | 4.07564 |
| 2000 | 4.08022 |
| 1999 | 4.08289 |
| 1998 | 4.08364 |
| 1997 | 4.08326 |
| 1996 | 4.07977 |
| 1995 | 4.06948 |
| 1994 | 4.04242 |
| 1993 | 4.01072 |
| 1992 | 4.0212 |
| 1991 | 4.08104 |
| 1990 | 4.16404 |
| 1989 | 4.27059 |
| 1988 | 4.38208 |
| 1987 | 4.43975 |
| 1986 | 4.43561 |
| 1985 | 4.4049 |
| 1984 | 4.36407 |
| 1983 | 4.32052 |
| 1982 | 4.27888 |
| 1981 | 4.24156 |
| 1980 | 4.2066 |
| 1979 | 4.17262 |
| 1978 | 4.14089 |
| 1977 | 4.11151 |
| 1976 | 4.08323 |
| 1975 | 4.0562 |
| 1974 | 4.03044 |
| 1973 | 4.00406 |
| 1972 | 3.97817 |
| 1971 | 3.95821 |
| 1970 | 3.94756 |
| 1969 | 3.94533 |
| 1968 | 3.95108 |
| 1967 | 3.96468 |
| 1966 | 3.98242 |
| 1965 | 4.00121 |
| 1964 | 4.02192 |
| 1963 | 4.04529 |
| 1962 | 4.06879 |
| 1961 | 4.09008 |
| 1960 | 4.10761 |