| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 4.089 |
| 2020 | 4.174 |
| 2019 | 4.257 |
| 2018 | 4.336 |
| 2017 | 4.396 |
| 2016 | 4.461 |
| 2015 | 4.523 |
| 2014 | 4.622 |
| 2013 | 4.749 |
| 2012 | 4.881 |
| 2011 | 4.97 |
| 2010 | 5.058 |
| 2009 | 5.174 |
| 2008 | 5.328 |
| 2007 | 5.462 |
| 2006 | 5.53 |
| 2005 | 5.519 |
| 2004 | 5.506 |
| 2003 | 5.547 |
| 2002 | 5.653 |
| 2001 | 5.774 |
| 2000 | 5.875 |
| 1999 | 5.953 |
| 1998 | 6.017 |
| 1997 | 6.079 |
| 1996 | 6.129 |
| 1995 | 6.173 |
| 1994 | 6.21 |
| 1993 | 6.246 |
| 1992 | 6.277 |
| 1991 | 6.323 |
| 1990 | 6.37 |
| 1989 | 6.434 |
| 1988 | 6.507 |
| 1987 | 6.572 |
| 1986 | 6.638 |
| 1985 | 6.693 |
| 1984 | 6.728 |
| 1983 | 6.76 |
| 1982 | 6.788 |
| 1981 | 6.834 |
| 1980 | 6.872 |
| 1979 | 6.919 |
| 1978 | 6.884 |
| 1977 | 6.841 |
| 1976 | 6.793 |
| 1975 | 6.744 |
| 1974 | 6.691 |
| 1973 | 6.651 |
| 1972 | 6.599 |
| 1971 | 6.542 |
| 1970 | 6.578 |
| 1969 | 6.644 |
| 1968 | 6.657 |
| 1967 | 6.65 |
| 1966 | 6.628 |
| 1965 | 6.617 |
| 1964 | 6.585 |
| 1963 | 6.556 |
| 1962 | 6.504 |
| 1961 | 6.446 |
| 1960 | 6.391 |