| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 3.78237 |
| 2021 | 3.11865 |
| 2020 | 1.16298 |
| 2019 | -0.0243828 |
| 2018 | 2.40369 |
| 2017 | 0.368277 |
| 2016 | 1.79272 |
| 2015 | 2.24943 |
| 2014 | -0.405677 |
| 2013 | -0.369174 |
| 2012 | 5.30834 |
| 2011 | 3.97161 |
| 2010 | 3.47504 |
| 2009 | 4.19006 |
| 2008 | 10.1291 |
| 2007 | 7.03666 |
| 2006 | 1.4962 |
| 2005 | 8.58488 |
| 2004 | 0.386942 |
| 2003 | -0.188481 |
| 2002 | 2.5723 |
| 2001 | 5.01252 |
| 2000 | 3.17839 |
| 1999 | 0.379747 |
| 1998 | 6.07816 |
| 1997 | 6.99168 |
| 1996 | 6.96864 |
| 1995 | 4.24946 |
| 1994 | 22.2144 |
| 1993 | -3.86881 |
| 1992 | -5.20194 |
| 1991 | -2.64074 |
| 1990 | 39.36 |
| 1989 | 1.39999 |
| 1988 | -5.3 |
| 1987 | 1.68456 |
| 1986 | -4.20028 |
| 1985 | -5.90018 |
| 1984 | 11.7175 |
| 1983 | 7.79998 |
| 1982 | 10 |
| 1981 | 11.5 |
| 1980 | 21.0948 |
| 1979 | 4.58652 |
| 1978 | 11.2114 |
| 1977 | 15.7478 |
| 1976 | 12.4164 |
| 1975 | -6.3928 |
| 1974 | 7.64726 |
| 1973 | 35.8375 |
| 1972 | 3.36118 |
| 1971 | 0.599833 |
| 1970 | 7.13664 |
| 1969 | 8.44311 |
| 1968 | -3.41981 |
| 1967 | -5.21908 |
| 1966 | 4.95789 |
| 1965 | 8.07682 |
| 1964 | -0.719002 |
| 1963 | 0.761496 |
| 1962 | -0.842793 |
| 1961 | 3.39385 |
| 1960 | - |