| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | 0.365376 |
| 2021 | 0.36777 |
| 2020 | 0.370084 |
| 2019 | 0.367341 |
| 2018 | 0.361189 |
| 2017 | 0.355684 |
| 2016 | 0.351062 |
| 2015 | 0.346137 |
| 2014 | 0.341944 |
| 2013 | 0.339876 |
| 2012 | 0.340007 |
| 2011 | 0.331499 |
| 2010 | 0.319074 |
| 2009 | 0.314154 |
| 2008 | 0.307994 |
| 2007 | 0.302165 |
| 2006 | 0.298239 |
| 2005 | 0.294155 |
| 2004 | 0.290071 |
| 2003 | 0.286385 |
| 2002 | 0.282445 |
| 2001 | 0.277979 |
| 2000 | 0.273702 |
| 1999 | 0.269605 |
| 1998 | 0.265262 |
| 1997 | 0.26053 |
| 1996 | 0.255721 |
| 1995 | 0.251086 |
| 1994 | 0.245954 |
| 1993 | 0.240395 |
| 1992 | 0.23316 |
| 1991 | 0.224932 |
| 1990 | 0.216562 |
| 1989 | 0.20856 |
| 1988 | 0.19872 |
| 1987 | 0.188957 |
| 1986 | 0.178988 |
| 1985 | 0.168522 |
| 1984 | 0.157153 |
| 1983 | 0.165025 |
| 1982 | 0.177162 |
| 1981 | 0.176584 |
| 1980 | 0.18314 |
| 1979 | 0.195819 |
| 1978 | 0.2139 |
| 1977 | 0.23649 |
| 1976 | 0.263295 |
| 1975 | 0.295119 |
| 1974 | 0.309878 |
| 1973 | 0.304368 |
| 1972 | 0.298761 |
| 1971 | 0.292946 |
| 1970 | 0.287339 |
| 1969 | 0.282706 |
| 1968 | 0.278778 |
| 1967 | 0.274339 |
| 1966 | 0.26876 |
| 1965 | 0.261414 |
| 1964 | 0.251116 |
| 1963 | 0.237279 |
| 1962 | 0.228415 |
| 1961 | 0.226254 |
| 1960 | 0.224472 |