| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 274.319 |
| 2020 | 269.44 |
| 2019 | 238.442 |
| 2018 | 239.18 |
| 2017 | 243.116 |
| 2016 | 248.855 |
| 2015 | 256.035 |
| 2014 | 250.698 |
| 2013 | 254.589 |
| 2012 | 257.051 |
| 2011 | 263.941 |
| 2010 | 266.331 |
| 2009 | 273.62 |
| 2008 | 279.829 |
| 2007 | 285.945 |
| 2006 | 290.549 |
| 2005 | 295.811 |
| 2004 | 301.378 |
| 2003 | 305.818 |
| 2002 | 312.844 |
| 2001 | 314.259 |
| 2000 | 312.371 |
| 1999 | 313.29 |
| 1998 | 313.524 |
| 1997 | 312.953 |
| 1996 | 315.047 |
| 1995 | 317.089 |
| 1994 | 326.924 |
| 1993 | 328.315 |
| 1992 | 333.79 |
| 1991 | 337.337 |
| 1990 | 336.77 |
| 1989 | 342.44 |
| 1988 | 346.037 |
| 1987 | 353.542 |
| 1986 | 360.62 |
| 1985 | 368.408 |
| 1984 | 374.764 |
| 1983 | 376.777 |
| 1982 | 386.495 |
| 1981 | 395.358 |
| 1980 | 411.654 |
| 1979 | 426.932 |
| 1978 | 442.39 |
| 1977 | 460.152 |
| 1976 | 473.094 |
| 1975 | 483.986 |
| 1974 | 491.713 |
| 1973 | 498.191 |
| 1972 | 499.329 |
| 1971 | 511.8 |
| 1970 | 499.972 |
| 1969 | 499.345 |
| 1968 | 497.842 |
| 1967 | 496.802 |
| 1966 | 498.144 |
| 1965 | 498.791 |
| 1964 | 499.296 |
| 1963 | 500.437 |
| 1962 | 501.085 |
| 1961 | 503.065 |
| 1960 | 504.472 |