| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | 1.03929 |
| 2021 | 1.04352 |
| 2020 | 1.04668 |
| 2019 | 0.987936 |
| 2018 | 0.990309 |
| 2017 | 1.01098 |
| 2016 | 1.14393 |
| 2015 | 1.19599 |
| 2014 | 1.2477 |
| 2013 | 1.39744 |
| 2012 | 2.78268 |
| 2011 | 3.20073 |
| 2010 | 2.19695 |
| 2009 | 2.47529 |
| 2008 | 3.42464 |
| 2007 | 4.35743 |
| 2006 | 4.98585 |
| 2005 | 3.86721 |
| 2004 | 0.567465 |
| 2003 | 0.172123 |
| 2002 | 1.98976 |
| 2001 | 2.32512 |
| 2000 | 3.09702 |
| 1999 | 4.93776 |
| 1998 | 9.5948 |
| 1997 | 7.22488 |
| 1996 | 8.22795 |
| 1995 | 6.55983 |
| 1994 | 5.76279 |
| 1993 | 10.3075 |
| 1992 | 12.5397 |
| 1991 | -19.0148 |
| 1990 | -18.3312 |
| 1989 | -2.6542 |
| 1988 | -2.34935 |
| 1987 | -2.01281 |
| 1986 | -1.67571 |
| 1985 | -1.34217 |
| 1984 | 0.347972 |
| 1983 | 1.32317 |
| 1982 | 1.27429 |
| 1981 | 1.38537 |
| 1980 | 1.46386 |
| 1979 | 1.49416 |
| 1978 | 1.51816 |
| 1977 | 1.46656 |
| 1976 | 1.42066 |
| 1975 | 1.44889 |
| 1974 | 1.46409 |
| 1973 | 1.46214 |
| 1972 | 1.4127 |
| 1971 | 1.43442 |
| 1970 | 1.50883 |
| 1969 | 1.52394 |
| 1968 | 1.53041 |
| 1967 | 1.54252 |
| 1966 | 1.56628 |
| 1965 | 1.59374 |
| 1964 | 1.59896 |
| 1963 | 1.61604 |
| 1962 | 1.62185 |
| 1961 | 1.61778 |
| 1960 | - |