| 年份 | 贝宁 |
|---|---|
| 2023 | - |
| 2022 | 3.84311 |
| 2021 | 3.9036 |
| 2020 | 3.98002 |
| 2019 | 4.04077 |
| 2018 | 4.07886 |
| 2017 | 4.10551 |
| 2016 | 4.11168 |
| 2015 | 4.11568 |
| 2014 | 4.09317 |
| 2013 | 4.06477 |
| 2012 | 4.0936 |
| 2011 | 4.11612 |
| 2010 | 4.13253 |
| 2009 | 4.15071 |
| 2008 | 4.16983 |
| 2007 | 4.10793 |
| 2006 | 4.30016 |
| 2005 | 4.42828 |
| 2004 | 4.29069 |
| 2003 | 4.28699 |
| 2002 | 3.99513 |
| 2001 | 3.83601 |
| 2000 | 3.87149 |
| 1999 | 3.89201 |
| 1998 | 3.87653 |
| 1997 | 3.75317 |
| 1996 | 3.41692 |
| 1995 | 2.9069 |
| 1994 | 4.59288 |
| 1993 | 5.30963 |
| 1992 | 4.69691 |
| 1991 | 5.24777 |
| 1990 | 5.25434 |
| 1989 | 5.25178 |
| 1988 | 5.26677 |
| 1987 | 5.26098 |
| 1986 | 5.2535 |
| 1985 | 5.2361 |
| 1984 | 5.233 |
| 1983 | 5.23148 |
| 1982 | 5.22772 |
| 1981 | 5.19326 |
| 1980 | 5.13937 |
| 1979 | 6.89586 |
| 1978 | 7.57187 |
| 1977 | 7.585 |
| 1976 | 7.61253 |
| 1975 | 7.61018 |
| 1974 | 7.63283 |
| 1973 | 7.65574 |
| 1972 | 7.69601 |
| 1971 | 7.69474 |
| 1970 | 7.71923 |
| 1969 | 7.73796 |
| 1968 | 7.75999 |
| 1967 | 7.76577 |
| 1966 | 7.77501 |
| 1965 | 7.75907 |
| 1964 | 7.74781 |
| 1963 | 7.71707 |
| 1962 | 7.67959 |
| 1961 | 7.61377 |
| 1960 | - |