| 年份 | 塞拉利昂  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 3.26384 | 
| 2021 | 3.23958 | 
| 2020 | 3.2164 | 
| 2019 | 3.19401 | 
| 2018 | 3.17129 | 
| 2017 | 3.14603 | 
| 2016 | 3.11943 | 
| 2015 | 3.09315 | 
| 2014 | 3.06514 | 
| 2013 | 3.03651 | 
| 2012 | 3.01064 | 
| 2011 | 2.98727 | 
| 2010 | 2.96509 | 
| 2009 | 2.94476 | 
| 2008 | 2.92445 | 
| 2007 | 2.90509 | 
| 2006 | 2.88989 | 
| 2005 | 2.88101 | 
| 2004 | 2.86119 | 
| 2003 | 2.84938 | 
| 2002 | 2.89017 | 
| 2001 | 2.95918 | 
| 2000 | 3.02863 | 
| 1999 | 3.12761 | 
| 1998 | 3.23081 | 
| 1997 | 3.27137 | 
| 1996 | 3.27453 | 
| 1995 | 3.2756 | 
| 1994 | 3.27695 | 
| 1993 | 3.2878 | 
| 1992 | 3.30948 | 
| 1991 | 3.33731 | 
| 1990 | 3.36397 | 
| 1989 | 3.38944 | 
| 1988 | 3.41322 | 
| 1987 | 3.43539 | 
| 1986 | 3.45851 | 
| 1985 | 3.48409 | 
| 1984 | 3.5103 | 
| 1983 | 3.53468 | 
| 1982 | 3.55771 | 
| 1981 | 3.5807 | 
| 1980 | 3.60405 | 
| 1979 | 3.62759 | 
| 1978 | 3.65091 | 
| 1977 | 3.67333 | 
| 1976 | 3.69452 | 
| 1975 | 3.71448 | 
| 1974 | 3.73292 | 
| 1973 | 3.74913 | 
| 1972 | 3.76352 | 
| 1971 | 3.77714 | 
| 1970 | 3.78992 | 
| 1969 | 3.80185 | 
| 1968 | 3.813 | 
| 1967 | 3.82318 | 
| 1966 | 3.83194 | 
| 1965 | 3.83871 | 
| 1964 | 3.84374 | 
| 1963 | 3.8473 | 
| 1962 | 3.8491 | 
| 1961 | 3.84947 | 
| 1960 | 3.8488 |