| 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 |