| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 8.838 |
| 2020 | 8.753 |
| 2019 | 8.658 |
| 2018 | 8.793 |
| 2017 | 8.954 |
| 2016 | 9.059 |
| 2015 | 9.715 |
| 2014 | 9.799 |
| 2013 | 9.482 |
| 2012 | 9.57 |
| 2011 | 9.741 |
| 2010 | 9.907 |
| 2009 | 10.115 |
| 2008 | 10.421 |
| 2007 | 10.765 |
| 2006 | 11.171 |
| 2005 | 11.599 |
| 2004 | 12.134 |
| 2003 | 13.852 |
| 2002 | 13.58 |
| 2001 | 14.312 |
| 2000 | 15.228 |
| 1999 | 16.141 |
| 1998 | 16.855 |
| 1997 | 17.565 |
| 1996 | 19.875 |
| 1995 | 20.233 |
| 1994 | 21.786 |
| 1993 | 21.512 |
| 1992 | 21.008 |
| 1991 | 21.006 |
| 1990 | 25.501 |
| 1989 | 20.475 |
| 1988 | 20.102 |
| 1987 | 19.738 |
| 1986 | 19.432 |
| 1985 | 19.688 |
| 1984 | 19.257 |
| 1983 | 19.419 |
| 1982 | 19.641 |
| 1981 | 19.94 |
| 1980 | 20.321 |
| 1979 | 20.654 |
| 1978 | 20.972 |
| 1977 | 21.362 |
| 1976 | 21.784 |
| 1975 | 22.149 |
| 1974 | 22.436 |
| 1973 | 22.797 |
| 1972 | 23.129 |
| 1971 | 23.577 |
| 1970 | 23.955 |
| 1969 | 24.363 |
| 1968 | 24.718 |
| 1967 | 25.015 |
| 1966 | 25.296 |
| 1965 | 25.52 |
| 1964 | 25.66 |
| 1963 | 25.723 |
| 1962 | 25.712 |
| 1961 | 25.683 |
| 1960 | 25.588 |