| 年份 | 贝宁 |
|---|---|
| 2023 | - |
| 2022 | 0.921196 |
| 2021 | 0.93687 |
| 2020 | 0.958336 |
| 2019 | 0.992112 |
| 2018 | 1.02648 |
| 2017 | 1.044 |
| 2016 | 1.05143 |
| 2015 | 1.05188 |
| 2014 | 1.04774 |
| 2013 | 1.04037 |
| 2012 | 1.03182 |
| 2011 | 1.02448 |
| 2010 | 1.01859 |
| 2009 | 1.0145 |
| 2008 | 1.01348 |
| 2007 | 1.01553 |
| 2006 | 1.01817 |
| 2005 | 1.02195 |
| 2004 | 1.02708 |
| 2003 | 1.03111 |
| 2002 | 1.03485 |
| 2001 | 1.03971 |
| 2000 | 1.04657 |
| 1999 | 1.05568 |
| 1998 | 1.06732 |
| 1997 | 1.08138 |
| 1996 | 1.09644 |
| 1995 | 1.11016 |
| 1994 | 1.12093 |
| 1993 | 1.14372 |
| 1992 | 1.17178 |
| 1991 | 1.18922 |
| 1990 | 1.20543 |
| 1989 | 1.22025 |
| 1988 | 1.23354 |
| 1987 | 1.24588 |
| 1986 | 1.25915 |
| 1985 | 1.27499 |
| 1984 | 1.29331 |
| 1983 | 1.31404 |
| 1982 | 1.33707 |
| 1981 | 1.36057 |
| 1980 | 1.38233 |
| 1979 | 1.40177 |
| 1978 | 1.41844 |
| 1977 | 1.43414 |
| 1976 | 1.45306 |
| 1975 | 1.47712 |
| 1974 | 1.50634 |
| 1973 | 1.54109 |
| 1972 | 1.57941 |
| 1971 | 1.61526 |
| 1970 | 1.64463 |
| 1969 | 1.6675 |
| 1968 | 1.68232 |
| 1967 | 1.69036 |
| 1966 | 1.69821 |
| 1965 | 1.71012 |
| 1964 | 1.72565 |
| 1963 | 1.7443 |
| 1962 | 1.76685 |
| 1961 | 1.79129 |
| 1960 | 1.81505 |