| 年份 | 贝宁 |
|---|---|
| 2023 | - |
| 2022 | 1.7212 |
| 2021 | 1.70187 |
| 2020 | 1.68485 |
| 2019 | 1.66808 |
| 2018 | 1.65087 |
| 2017 | 1.63631 |
| 2016 | 1.62475 |
| 2015 | 1.61657 |
| 2014 | 1.57837 |
| 2013 | 1.52192 |
| 2012 | 1.48767 |
| 2011 | 1.46609 |
| 2010 | 1.45217 |
| 2009 | 1.48463 |
| 2008 | 1.54404 |
| 2007 | 1.57456 |
| 2006 | 1.58704 |
| 2005 | 1.58763 |
| 2004 | 1.58176 |
| 2003 | 1.57103 |
| 2002 | 1.55768 |
| 2001 | 1.54555 |
| 2000 | 1.53607 |
| 1999 | 1.52874 |
| 1998 | 1.5256 |
| 1997 | 1.52737 |
| 1996 | 1.53119 |
| 1995 | 1.53548 |
| 1994 | 1.54134 |
| 1993 | 1.55633 |
| 1992 | 1.57684 |
| 1991 | 1.59623 |
| 1990 | 1.61946 |
| 1989 | 1.64593 |
| 1988 | 1.67547 |
| 1987 | 1.7079 |
| 1986 | 1.74258 |
| 1985 | 1.7792 |
| 1984 | 1.81798 |
| 1983 | 1.85812 |
| 1982 | 1.89981 |
| 1981 | 1.94434 |
| 1980 | 1.9916 |
| 1979 | 2.04071 |
| 1978 | 2.09124 |
| 1977 | 2.14354 |
| 1976 | 2.19735 |
| 1975 | 2.25202 |
| 1974 | 2.30769 |
| 1973 | 2.36438 |
| 1972 | 2.42109 |
| 1971 | 2.47623 |
| 1970 | 2.52852 |
| 1969 | 2.57768 |
| 1968 | 2.62392 |
| 1967 | 2.66621 |
| 1966 | 2.70368 |
| 1965 | 2.73555 |
| 1964 | 2.76057 |
| 1963 | 2.77735 |
| 1962 | 2.78929 |
| 1961 | 2.80495 |
| 1960 | 2.82951 |