| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | 2.08209 |
| 2021 | 2.05886 |
| 2020 | 2.03117 |
| 2019 | 1.94236 |
| 2018 | 1.9154 |
| 2017 | 1.90549 |
| 2016 | 2.0126 |
| 2015 | 2.03541 |
| 2014 | 2.05859 |
| 2013 | 2.18235 |
| 2012 | 3.5383 |
| 2011 | 3.93154 |
| 2010 | 2.89963 |
| 2009 | 3.15229 |
| 2008 | 4.07646 |
| 2007 | 5.00498 |
| 2006 | 5.6274 |
| 2005 | 4.50464 |
| 2004 | 1.20093 |
| 2003 | 0.799708 |
| 2002 | 2.61345 |
| 2001 | 2.94137 |
| 2000 | 3.7113 |
| 1999 | 5.54645 |
| 1998 | 10.1999 |
| 1997 | 7.82276 |
| 1996 | 2.83215 |
| 1995 | 0.807199 |
| 1994 | -0.35571 |
| 1993 | 3.83021 |
| 1992 | 5.68259 |
| 1991 | -13.0577 |
| 1990 | -12.6455 |
| 1989 | 2.7476 |
| 1988 | 2.79273 |
| 1987 | 2.8469 |
| 1986 | 2.91011 |
| 1985 | 2.96946 |
| 1984 | 3.03725 |
| 1983 | 2.96161 |
| 1982 | 2.86905 |
| 1981 | 2.93356 |
| 1980 | 2.97327 |
| 1979 | 2.9601 |
| 1978 | 2.94085 |
| 1977 | 2.84597 |
| 1976 | 2.76409 |
| 1975 | 2.75034 |
| 1974 | 2.71667 |
| 1973 | 2.6702 |
| 1972 | 2.58585 |
| 1971 | 2.5696 |
| 1970 | 2.60854 |
| 1969 | 2.58783 |
| 1968 | 2.5635 |
| 1967 | 2.54048 |
| 1966 | 2.53117 |
| 1965 | 2.52661 |
| 1964 | 2.50303 |
| 1963 | 2.4882 |
| 1962 | 2.46548 |
| 1961 | 2.43093 |
| 1960 | - |