| 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 |