| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 8.72095 |
| 2021 | 9.99372 |
| 2020 | 9.73785 |
| 2019 | 10.7594 |
| 2018 | 11.2957 |
| 2017 | 12.8065 |
| 2016 | 12.1833 |
| 2015 | 14.2684 |
| 2014 | 15.9459 |
| 2013 | 16.979 |
| 2012 | 16.1006 |
| 2011 | 15.2896 |
| 2010 | 16.1844 |
| 2009 | 14.9779 |
| 2008 | 13.1805 |
| 2007 | 13.0665 |
| 2006 | 13.8704 |
| 2005 | 14.4114 |
| 2004 | 14.2586 |
| 2003 | 13.2742 |
| 2002 | 11.9188 |
| 2001 | 13.4558 |
| 2000 | 14.3397 |
| 1999 | 12.6557 |
| 1998 | 13.9701 |
| 1997 | 13.5379 |
| 1996 | 15.2959 |
| 1995 | 14.5381 |
| 1994 | 13.141 |
| 1993 | 10.9093 |
| 1992 | 11.7817 |
| 1991 | 12.018 |
| 1990 | 15.0686 |
| 1989 | 16.5997 |
| 1988 | 18.2999 |
| 1987 | 20.8029 |
| 1986 | 20.0004 |
| 1985 | 20.686 |
| 1984 | 22.9053 |
| 1983 | 20.8249 |
| 1982 | 20.9706 |
| 1981 | 24.1558 |
| 1980 | 24.5842 |
| 1979 | 28.5411 |
| 1978 | 22.5306 |
| 1977 | 19.6426 |
| 1976 | 22.2637 |
| 1975 | 19.2465 |
| 1974 | 12.2706 |
| 1973 | 15.5148 |
| 1972 | 14.2137 |
| 1971 | 12.3678 |
| 1970 | 10.7724 |
| 1969 | 9.35766 |
| 1968 | 7.9776 |
| 1967 | 8.42954 |
| 1966 | 12.4527 |
| 1965 | 9.48485 |
| 1964 | 9.26666 |
| 1963 | 9.31115 |
| 1962 | 9.28358 |
| 1961 | 8.12123 |
| 1960 | 7.10041 |