| 年份 | 塞拉利昂 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 3.978 |
| 2020 | 4.08 |
| 2019 | 4.192 |
| 2018 | 4.294 |
| 2017 | 4.389 |
| 2016 | 4.466 |
| 2015 | 4.548 |
| 2014 | 4.703 |
| 2013 | 4.873 |
| 2012 | 5.064 |
| 2011 | 5.209 |
| 2010 | 5.327 |
| 2009 | 5.448 |
| 2008 | 5.563 |
| 2007 | 5.643 |
| 2006 | 5.737 |
| 2005 | 5.807 |
| 2004 | 5.919 |
| 2003 | 6.087 |
| 2002 | 6.23 |
| 2001 | 6.305 |
| 2000 | 6.355 |
| 1999 | 6.423 |
| 1998 | 6.495 |
| 1997 | 6.531 |
| 1996 | 6.552 |
| 1995 | 6.555 |
| 1994 | 6.557 |
| 1993 | 6.569 |
| 1992 | 6.555 |
| 1991 | 6.553 |
| 1990 | 6.567 |
| 1989 | 6.571 |
| 1988 | 6.588 |
| 1987 | 6.609 |
| 1986 | 6.597 |
| 1985 | 6.592 |
| 1984 | 6.592 |
| 1983 | 6.573 |
| 1982 | 6.563 |
| 1981 | 6.554 |
| 1980 | 6.562 |
| 1979 | 6.582 |
| 1978 | 6.591 |
| 1977 | 6.568 |
| 1976 | 6.553 |
| 1975 | 6.546 |
| 1974 | 6.534 |
| 1973 | 6.473 |
| 1972 | 6.447 |
| 1971 | 6.429 |
| 1970 | 6.411 |
| 1969 | 6.393 |
| 1968 | 6.385 |
| 1967 | 6.383 |
| 1966 | 6.345 |
| 1965 | 6.311 |
| 1964 | 6.294 |
| 1963 | 6.261 |
| 1962 | 6.222 |
| 1961 | 6.205 |
| 1960 | 6.175 |