| 年份 | 贝宁 |
|---|---|
| 2023 | - |
| 2022 | 1.59456 |
| 2021 | 1.67407 |
| 2020 | 1.7609 |
| 2019 | 1.83963 |
| 2018 | 1.8952 |
| 2017 | 1.93886 |
| 2016 | 1.96162 |
| 2015 | 1.98183 |
| 2014 | 1.97516 |
| 2013 | 1.97034 |
| 2012 | 1.99399 |
| 2011 | 2.01901 |
| 2010 | 2.03748 |
| 2009 | 2.05736 |
| 2008 | 2.06954 |
| 2007 | 2.00837 |
| 2006 | 2.20515 |
| 2005 | 2.33324 |
| 2004 | 2.19108 |
| 2003 | 2.19075 |
| 2002 | 2.37022 |
| 2001 | 2.49705 |
| 2000 | 2.52411 |
| 1999 | 2.54878 |
| 1998 | 2.53742 |
| 1997 | 2.40948 |
| 1996 | 2.07288 |
| 1995 | 1.5666 |
| 1994 | 3.24782 |
| 1993 | 3.96813 |
| 1992 | 2.16505 |
| 1991 | 1.8923 |
| 1990 | 1.89479 |
| 1989 | 1.90038 |
| 1988 | 1.90417 |
| 1987 | 1.9041 |
| 1986 | 1.89194 |
| 1985 | 1.88291 |
| 1984 | 1.87293 |
| 1983 | 1.87311 |
| 1982 | 1.87013 |
| 1981 | 1.84089 |
| 1980 | 1.77594 |
| 1979 | 1.06981 |
| 1978 | 0.842095 |
| 1977 | 0.867617 |
| 1976 | 0.871193 |
| 1975 | 0.882979 |
| 1974 | 0.90238 |
| 1973 | 0.935713 |
| 1972 | 0.955834 |
| 1971 | 0.970895 |
| 1970 | 0.988994 |
| 1969 | 1.01406 |
| 1968 | 1.0258 |
| 1967 | 1.03672 |
| 1966 | 1.04357 |
| 1965 | 1.03545 |
| 1964 | 1.01451 |
| 1963 | 0.985616 |
| 1962 | 0.952718 |
| 1961 | 0.895303 |
| 1960 | - |