| 年份 | 塞拉利昂  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 2.17409 | 
| 2021 | 2.24177 | 
| 2020 | 2.29903 | 
| 2019 | 2.33284 | 
| 2018 | 2.36471 | 
| 2017 | 2.42113 | 
| 2016 | 2.41951 | 
| 2015 | 2.40869 | 
| 2014 | 2.49318 | 
| 2013 | 2.56345 | 
| 2012 | 2.62984 | 
| 2011 | 2.69287 | 
| 2010 | 2.78607 | 
| 2009 | 2.73657 | 
| 2008 | 2.52211 | 
| 2007 | 2.20265 | 
| 2006 | 2.20036 | 
| 2005 | 2.67484 | 
| 2004 | 3.35235 | 
| 2003 | 4.0191 | 
| 2002 | 5.66343 | 
| 2001 | 5.78541 | 
| 2000 | 2.40478 | 
| 1999 | 0.564028 | 
| 1998 | 1.01519 | 
| 1997 | 1.31756 | 
| 1996 | 0.535571 | 
| 1995 | 0.212893 | 
| 1994 | 0.447447 | 
| 1993 | -0.136718 | 
| 1992 | -1.76515 | 
| 1991 | 1.21288 | 
| 1990 | 3.9188 | 
| 1989 | 2.50636 | 
| 1988 | 2.70753 | 
| 1987 | 2.69432 | 
| 1986 | 2.46308 | 
| 1985 | 2.24283 | 
| 1984 | 2.21985 | 
| 1983 | 2.15868 | 
| 1982 | 2.07568 | 
| 1981 | 2.04666 | 
| 1980 | 2.02316 | 
| 1979 | 1.98507 | 
| 1978 | 1.96577 | 
| 1977 | 1.88809 | 
| 1976 | 1.84635 | 
| 1975 | 1.88528 | 
| 1974 | 1.90237 | 
| 1973 | 1.91089 | 
| 1972 | 1.89723 | 
| 1971 | 1.91899 | 
| 1970 | 1.94996 | 
| 1969 | 1.94664 | 
| 1968 | 1.96403 | 
| 1967 | 1.95223 | 
| 1966 | 1.93157 | 
| 1965 | 1.91824 | 
| 1964 | 1.87521 | 
| 1963 | 1.82288 | 
| 1962 | 1.77182 | 
| 1961 | 1.71274 | 
| 1960 | - |