| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | 13.038 |
| 2021 | 13.1096 |
| 2020 | 13.1683 |
| 2019 | 13.157 |
| 2018 | 13.067 |
| 2017 | 12.9194 |
| 2016 | 12.7461 |
| 2015 | 12.5907 |
| 2014 | 12.4574 |
| 2013 | 12.3376 |
| 2012 | 12.22 |
| 2011 | 12.2033 |
| 2010 | 12.1874 |
| 2009 | 12.046 |
| 2008 | 11.9222 |
| 2007 | 11.818 |
| 2006 | 11.7206 |
| 2005 | 11.6521 |
| 2004 | 11.6161 |
| 2003 | 11.6159 |
| 2002 | 11.657 |
| 2001 | 11.7448 |
| 2000 | 11.8646 |
| 1999 | 11.9905 |
| 1998 | 12.1606 |
| 1997 | 12.3434 |
| 1996 | 12.4915 |
| 1995 | 12.6334 |
| 1994 | 12.7932 |
| 1993 | 12.8719 |
| 1992 | 12.89 |
| 1991 | 12.9053 |
| 1990 | 12.7497 |
| 1989 | 12.5887 |
| 1988 | 12.4736 |
| 1987 | 12.3409 |
| 1986 | 12.2071 |
| 1985 | 12.0836 |
| 1984 | 11.9992 |
| 1983 | 11.9436 |
| 1982 | 11.8878 |
| 1981 | 11.8455 |
| 1980 | 11.8011 |
| 1979 | 11.7372 |
| 1978 | 11.6622 |
| 1977 | 11.5931 |
| 1976 | 11.5228 |
| 1975 | 11.4477 |
| 1974 | 11.3786 |
| 1973 | 11.3134 |
| 1972 | 11.24 |
| 1971 | 11.1576 |
| 1970 | 11.0751 |
| 1969 | 10.998 |
| 1968 | 10.9223 |
| 1967 | 10.8432 |
| 1966 | 10.7572 |
| 1965 | 10.6657 |
| 1964 | 10.4996 |
| 1963 | 10.3768 |
| 1962 | 10.419 |
| 1961 | 10.5591 |
| 1960 | 10.7922 |