| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 54.8 |
| 2020 | 55.3 |
| 2019 | 55.5 |
| 2018 | 55.8 |
| 2017 | 55.9 |
| 2016 | 56.1 |
| 2015 | 56.4 |
| 2014 | 56.8 |
| 2013 | 57.3 |
| 2012 | 58.1 |
| 2011 | 59.1 |
| 2010 | 60.6 |
| 2009 | 62.2 |
| 2008 | 64.3 |
| 2007 | 66.8 |
| 2006 | 69.7 |
| 2005 | 73.1 |
| 2004 | 76.8 |
| 2003 | 80.8 |
| 2002 | 84.8 |
| 2001 | 88.6 |
| 2000 | 92.2 |
| 1999 | 95.1 |
| 1998 | 98.2 |
| 1997 | 101.5 |
| 1996 | 105.2 |
| 1995 | 109.3 |
| 1994 | 113.7 |
| 1993 | 117.8 |
| 1992 | 121.4 |
| 1991 | 124.3 |
| 1990 | 126.9 |
| 1989 | 128.4 |
| 1988 | 129.2 |
| 1987 | 129.3 |
| 1986 | 128.8 |
| 1985 | 127.6 |
| 1984 | 125.9 |
| 1983 | 124.4 |
| 1982 | 123.1 |
| 1981 | 122.4 |
| 1980 | 122.6 |
| 1979 | 123.6 |
| 1978 | 125.1 |
| 1977 | 126.9 |
| 1976 | 128.4 |
| 1975 | 129.5 |
| 1974 | 129.8 |
| 1973 | 129.3 |
| 1972 | 128.3 |
| 1971 | 126.9 |
| 1970 | 125.3 |
| 1969 | 123.8 |
| 1968 | 122.4 |
| 1967 | 120.9 |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |