| 年份 | 塞拉利昂 |
|---|---|
| 2023 | - |
| 2022 | 3.22682 |
| 2021 | 3.28238 |
| 2020 | 3.32707 |
| 2019 | 3.34775 |
| 2018 | 3.36603 |
| 2017 | 3.4059 |
| 2016 | 3.39199 |
| 2015 | 3.3858 |
| 2014 | 3.47743 |
| 2013 | 3.55243 |
| 2012 | 3.62872 |
| 2011 | 3.69669 |
| 2010 | 3.79483 |
| 2009 | 3.75299 |
| 2008 | 3.54634 |
| 2007 | 3.2321 |
| 2006 | 3.23511 |
| 2005 | 3.55358 |
| 2004 | 4.02131 |
| 2003 | 4.68985 |
| 2002 | 6.33584 |
| 2001 | 6.45961 |
| 2000 | 3.08642 |
| 1999 | 1.24461 |
| 1998 | 1.69756 |
| 1997 | 2.00172 |
| 1996 | 1.2245 |
| 1995 | 0.90361 |
| 1994 | 1.14304 |
| 1993 | 0.557771 |
| 1992 | -1.0658 |
| 1991 | 1.91115 |
| 1990 | 4.62198 |
| 1989 | 3.21148 |
| 1988 | 3.41767 |
| 1987 | 3.40328 |
| 1986 | 3.48293 |
| 1985 | 3.63387 |
| 1984 | 3.62408 |
| 1983 | 3.56653 |
| 1982 | 3.49385 |
| 1981 | 3.47505 |
| 1980 | 3.45873 |
| 1979 | 3.43115 |
| 1978 | 3.41895 |
| 1977 | 3.3486 |
| 1976 | 3.31771 |
| 1975 | 4.04336 |
| 1974 | 4.95553 |
| 1973 | 4.99343 |
| 1972 | 5.02131 |
| 1971 | 5.07294 |
| 1970 | 5.13319 |
| 1969 | 5.15905 |
| 1968 | 5.21419 |
| 1967 | 5.22601 |
| 1966 | 5.23762 |
| 1965 | 5.24592 |
| 1964 | 5.23871 |
| 1963 | 4.98357 |
| 1962 | 4.87355 |
| 1961 | 4.8389 |
| 1960 | - |