| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 19.9651 |
| 2020 | 19.9651 |
| 2019 | 19.9651 |
| 2018 | 19.7976 |
| 2017 | 19.4839 |
| 2016 | 19.1703 |
| 2015 | 18.8585 |
| 2014 | 18.5462 |
| 2013 | 18.2366 |
| 2012 | 17.926 |
| 2011 | 17.6148 |
| 2010 | 17.3073 |
| 2009 | 16.9968 |
| 2008 | 16.6863 |
| 2007 | 16.3744 |
| 2006 | 16.0694 |
| 2005 | 15.7596 |
| 2004 | 15.4496 |
| 2003 | 15.1355 |
| 2002 | 14.8211 |
| 2001 | 14.5068 |
| 2000 | 14.1935 |
| 1999 | 13.8781 |
| 1998 | 13.5667 |
| 1997 | 13.2421 |
| 1996 | 12.928 |
| 1995 | 12.6091 |
| 1994 | 12.2931 |
| 1993 | 11.9808 |
| 1992 | 11.6686 |
| 1991 | 11.3582 |
| 1990 | 11.044 |
| 1989 | 12.0822 |
| 1988 | 12.0822 |
| 1987 | 12.1134 |
| 1986 | 12.0511 |
| 1985 | 11.9576 |
| 1984 | 11.9369 |
| 1983 | 11.9265 |
| 1982 | 11.8746 |
| 1981 | 11.8331 |
| 1980 | 11.8331 |
| 1979 | 11.8331 |
| 1978 | 11.8331 |
| 1977 | 11.8331 |
| 1976 | 11.7811 |
| 1975 | 11.7811 |
| 1974 | 11.7811 |
| 1973 | 11.7811 |
| 1972 | 11.7811 |
| 1971 | 11.7811 |
| 1970 | 11.7811 |
| 1969 | 11.8019 |
| 1968 | 11.8019 |
| 1967 | 11.8227 |
| 1966 | 11.8227 |
| 1965 | 11.8538 |
| 1964 | 11.8538 |
| 1963 | 11.885 |
| 1962 | 11.885 |
| 1961 | 11.9057 |
| 1960 | - |