| 年份 | 塞拉利昂  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 0.272912 | 
| 2021 | 0.277398 | 
| 2020 | 0.282986 | 
| 2019 | 0.285241 | 
| 2018 | 0.283545 | 
| 2017 | 0.281797 | 
| 2016 | 0.280436 | 
| 2015 | 0.279519 | 
| 2014 | 0.278928 | 
| 2013 | 0.278568 | 
| 2012 | 0.278494 | 
| 2011 | 0.278892 | 
| 2010 | 0.279852 | 
| 2009 | 0.281245 | 
| 2008 | 0.283199 | 
| 2007 | 0.285658 | 
| 2006 | 0.288162 | 
| 2005 | 0.290707 | 
| 2004 | 0.293477 | 
| 2003 | 0.296623 | 
| 2002 | 0.300125 | 
| 2001 | 0.303733 | 
| 2000 | 0.307661 | 
| 1999 | 0.312666 | 
| 1998 | 0.318356 | 
| 1997 | 0.323627 | 
| 1996 | 0.328306 | 
| 1995 | 0.333115 | 
| 1994 | 0.33809 | 
| 1993 | 0.34246 | 
| 1992 | 0.346262 | 
| 1991 | 0.349914 | 
| 1990 | 0.352916 | 
| 1989 | 0.355339 | 
| 1988 | 0.35744 | 
| 1987 | 0.359109 | 
| 1986 | 0.360486 | 
| 1985 | 0.361811 | 
| 1984 | 0.362806 | 
| 1983 | 0.36348 | 
| 1982 | 0.363848 | 
| 1981 | 0.363689 | 
| 1980 | 0.363311 | 
| 1979 | 0.36258 | 
| 1978 | 0.361424 | 
| 1977 | 0.359841 | 
| 1976 | 0.357577 | 
| 1975 | 0.354878 | 
| 1974 | 0.351818 | 
| 1973 | 0.348293 | 
| 1972 | 0.34459 | 
| 1971 | 0.340412 | 
| 1970 | 0.335865 | 
| 1969 | 0.331241 | 
| 1968 | 0.325932 | 
| 1967 | 0.319796 | 
| 1966 | 0.312955 | 
| 1965 | 0.305719 | 
| 1964 | 0.297867 | 
| 1963 | 0.288963 | 
| 1962 | 0.279164 | 
| 1961 | 0.268634 | 
| 1960 | 0.25753 |