| 年份 | 贝宁 |
|---|---|
| 2023 | - |
| 2022 | 2.70204 |
| 2021 | 2.75971 |
| 2020 | 2.82914 |
| 2019 | 2.88707 |
| 2018 | 2.92239 |
| 2017 | 2.94632 |
| 2016 | 2.94983 |
| 2015 | 2.95125 |
| 2014 | 2.92623 |
| 2013 | 2.89992 |
| 2012 | 2.91501 |
| 2011 | 2.92811 |
| 2010 | 2.93493 |
| 2009 | 2.94335 |
| 2008 | 2.94774 |
| 2007 | 2.87556 |
| 2006 | 3.05982 |
| 2005 | 3.17735 |
| 2004 | 3.02646 |
| 2003 | 3.01428 |
| 2002 | 3.00138 |
| 2001 | 3.01243 |
| 2000 | 3.03846 |
| 1999 | 3.05729 |
| 1998 | 3.04015 |
| 1997 | 2.90971 |
| 1996 | 2.56903 |
| 1995 | 2.05718 |
| 1994 | 3.73596 |
| 1993 | 4.45082 |
| 1992 | 3.06479 |
| 1991 | 3.0622 |
| 1990 | 3.04063 |
| 1989 | 3.0183 |
| 1988 | 3.00087 |
| 1987 | 2.9743 |
| 1986 | 2.93926 |
| 1985 | 2.90362 |
| 1984 | 2.87202 |
| 1983 | 2.84829 |
| 1982 | 2.82201 |
| 1981 | 2.76861 |
| 1980 | 2.68429 |
| 1979 | 2.59108 |
| 1978 | 2.51909 |
| 1977 | 2.45846 |
| 1976 | 2.38718 |
| 1975 | 2.31828 |
| 1974 | 2.26384 |
| 1973 | 2.2236 |
| 1972 | 2.17877 |
| 1971 | 2.12508 |
| 1970 | 2.08131 |
| 1969 | 2.04525 |
| 1968 | 2.00109 |
| 1967 | 1.9565 |
| 1966 | 1.91151 |
| 1965 | 1.85284 |
| 1964 | 1.78591 |
| 1963 | 1.71202 |
| 1962 | 1.63619 |
| 1961 | 1.53778 |
| 1960 | - |