| 年份 | 利比里亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 29.9 |
| 2020 | 30.5 |
| 2019 | 31 |
| 2018 | 31.4 |
| 2017 | 31.8 |
| 2016 | 32.1 |
| 2015 | 32.2 |
| 2014 | 32.3 |
| 2013 | 32.3 |
| 2012 | 32.3 |
| 2011 | 32.5 |
| 2010 | 32.9 |
| 2009 | 33.6 |
| 2008 | 34.5 |
| 2007 | 35.6 |
| 2006 | 36.9 |
| 2005 | 38.3 |
| 2004 | 40.1 |
| 2003 | 41.9 |
| 2002 | 43.9 |
| 2001 | 46 |
| 2000 | 48 |
| 1999 | 50 |
| 1998 | 51.7 |
| 1997 | 53.2 |
| 1996 | 54.4 |
| 1995 | 55.4 |
| 1994 | 56.2 |
| 1993 | 56.8 |
| 1992 | 57.6 |
| 1991 | 58.6 |
| 1990 | 59.7 |
| 1989 | 60.6 |
| 1988 | 61.4 |
| 1987 | 62.3 |
| 1986 | 63.2 |
| 1985 | 64.5 |
| 1984 | 65.9 |
| 1983 | 67.6 |
| 1982 | 69.1 |
| 1981 | 70.7 |
| 1980 | 72.3 |
| 1979 | 73.8 |
| 1978 | 75.3 |
| 1977 | 76.8 |
| 1976 | 78.4 |
| 1975 | 80.1 |
| 1974 | 82 |
| 1973 | 84 |
| 1972 | 86.2 |
| 1971 | 88.5 |
| 1970 | 90.9 |
| 1969 | 93.4 |
| 1968 | 95.9 |
| 1967 | 98.2 |
| 1966 | 100.4 |
| 1965 | 102.4 |
| 1964 | 104.2 |
| 1963 | 105.3 |
| 1962 | - |
| 1961 | - |
| 1960 | - |