| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | 9.16301 |
| 2021 | 8.9931 |
| 2020 | 8.81915 |
| 2019 | 8.65757 |
| 2018 | 8.53078 |
| 2017 | 8.44374 |
| 2016 | 8.39982 |
| 2015 | 8.38207 |
| 2014 | 8.40363 |
| 2013 | 8.47599 |
| 2012 | 8.58387 |
| 2011 | 8.56043 |
| 2010 | 8.50133 |
| 2009 | 8.57687 |
| 2008 | 8.67455 |
| 2007 | 8.79681 |
| 2006 | 8.92773 |
| 2005 | 9.06863 |
| 2004 | 9.23207 |
| 2003 | 9.34824 |
| 2002 | 9.42471 |
| 2001 | 9.50204 |
| 2000 | 9.54439 |
| 1999 | 9.53932 |
| 1998 | 9.48969 |
| 1997 | 9.4214 |
| 1996 | 9.3202 |
| 1995 | 9.18655 |
| 1994 | 9.04811 |
| 1993 | 8.92476 |
| 1992 | 8.78908 |
| 1991 | 8.64015 |
| 1990 | 8.45537 |
| 1989 | 8.26611 |
| 1988 | 8.04679 |
| 1987 | 7.85132 |
| 1986 | 7.68841 |
| 1985 | 7.55763 |
| 1984 | 7.46377 |
| 1983 | 7.50437 |
| 1982 | 7.61528 |
| 1981 | 7.70003 |
| 1980 | 7.82984 |
| 1979 | 7.98699 |
| 1978 | 8.1491 |
| 1977 | 8.30645 |
| 1976 | 8.42911 |
| 1975 | 8.52061 |
| 1974 | 8.47861 |
| 1973 | 8.36705 |
| 1972 | 8.36373 |
| 1971 | 8.44102 |
| 1970 | 8.56328 |
| 1969 | 8.79091 |
| 1968 | 9.0471 |
| 1967 | 9.18067 |
| 1966 | 9.24623 |
| 1965 | 9.26656 |
| 1964 | 9.25989 |
| 1963 | 9.24087 |
| 1962 | 9.23868 |
| 1961 | 9.25658 |
| 1960 | 9.26198 |