| 年份 | 贝宁 |
|---|---|
| 2023 | - |
| 2022 | 3.07831 |
| 2021 | 3.06797 |
| 2020 | 3.06024 |
| 2019 | 3.05281 |
| 2018 | 3.04382 |
| 2017 | 3.0327 |
| 2016 | 3.01762 |
| 2015 | 2.99448 |
| 2014 | 2.9638 |
| 2013 | 2.92895 |
| 2012 | 2.89137 |
| 2011 | 2.85237 |
| 2010 | 2.81627 |
| 2009 | 2.7853 |
| 2008 | 2.75762 |
| 2007 | 2.73376 |
| 2006 | 2.71427 |
| 2005 | 2.70151 |
| 2004 | 2.67051 |
| 2003 | 2.64376 |
| 2002 | 2.6603 |
| 2001 | 2.70259 |
| 2000 | 2.76103 |
| 1999 | 2.85876 |
| 1998 | 2.96079 |
| 1997 | 3.01419 |
| 1996 | 3.03679 |
| 1995 | 3.03648 |
| 1994 | 3.01973 |
| 1993 | 3.00678 |
| 1992 | 2.99549 |
| 1991 | 2.97747 |
| 1990 | 2.96453 |
| 1989 | 2.95632 |
| 1988 | 2.95635 |
| 1987 | 2.96487 |
| 1986 | 2.97541 |
| 1985 | 2.9846 |
| 1984 | 2.99406 |
| 1983 | 3.00363 |
| 1982 | 3.01415 |
| 1981 | 3.03058 |
| 1980 | 3.05502 |
| 1979 | 3.08592 |
| 1978 | 3.12228 |
| 1977 | 3.16424 |
| 1976 | 3.21046 |
| 1975 | 3.25945 |
| 1974 | 3.31099 |
| 1973 | 3.36561 |
| 1972 | 3.42192 |
| 1971 | 3.47701 |
| 1970 | 3.52874 |
| 1969 | 3.57672 |
| 1968 | 3.62024 |
| 1967 | 3.66152 |
| 1966 | 3.70614 |
| 1965 | 3.75751 |
| 1964 | 3.81529 |
| 1963 | 3.879 |
| 1962 | 3.94649 |
| 1961 | 4.0121 |
| 1960 | 4.07117 |