| 年份 | 塞拉利昂 |
|---|---|
| 2023 | - |
| 2022 | 2.03456 |
| 2021 | 2.01142 |
| 2020 | 1.98945 |
| 2019 | 1.96598 |
| 2018 | 1.93927 |
| 2017 | 1.91417 |
| 2016 | 1.89324 |
| 2015 | 1.8765 |
| 2014 | 1.85379 |
| 2013 | 1.83752 |
| 2012 | 1.85517 |
| 2011 | 1.89248 |
| 2010 | 1.93214 |
| 2009 | 1.98852 |
| 2008 | 2.046 |
| 2007 | 2.06632 |
| 2006 | 2.06497 |
| 2005 | 2.06316 |
| 2004 | 2.06219 |
| 2003 | 2.06799 |
| 2002 | 2.08199 |
| 2001 | 2.10065 |
| 2000 | 2.12071 |
| 1999 | 2.14131 |
| 1998 | 2.16152 |
| 1997 | 2.18027 |
| 1996 | 2.19906 |
| 1995 | 2.22004 |
| 1994 | 2.24256 |
| 1993 | 2.26412 |
| 1992 | 2.28431 |
| 1991 | 2.30447 |
| 1990 | 2.32397 |
| 1989 | 2.34407 |
| 1988 | 2.36359 |
| 1987 | 2.38203 |
| 1986 | 2.39912 |
| 1985 | 2.41543 |
| 1984 | 2.43126 |
| 1983 | 2.44643 |
| 1982 | 2.46036 |
| 1981 | 2.47292 |
| 1980 | 2.4856 |
| 1979 | 2.49821 |
| 1978 | 2.51034 |
| 1977 | 2.52228 |
| 1976 | 2.53185 |
| 1975 | 2.5393 |
| 1974 | 2.54625 |
| 1973 | 2.55222 |
| 1972 | 2.5571 |
| 1971 | 2.56035 |
| 1970 | 2.56331 |
| 1969 | 2.56653 |
| 1968 | 2.56857 |
| 1967 | 2.56974 |
| 1966 | 2.56991 |
| 1965 | 2.56926 |
| 1964 | 2.5684 |
| 1963 | 2.56759 |
| 1962 | 2.56693 |
| 1961 | 2.56555 |
| 1960 | 2.56254 |