| 年份 | 塞拉利昂 |
|---|---|
| 2023 | - |
| 2022 | 2.4728 |
| 2021 | 2.44328 |
| 2020 | 2.41472 |
| 2019 | 2.38219 |
| 2018 | 2.34603 |
| 2017 | 2.31168 |
| 2016 | 2.27877 |
| 2015 | 2.24693 |
| 2014 | 2.21768 |
| 2013 | 2.18961 |
| 2012 | 2.16357 |
| 2011 | 2.14208 |
| 2010 | 2.12637 |
| 2009 | 2.10543 |
| 2008 | 2.08681 |
| 2007 | 2.10378 |
| 2006 | 2.14646 |
| 2005 | 2.19238 |
| 2004 | 2.25632 |
| 2003 | 2.32831 |
| 2002 | 2.36368 |
| 2001 | 2.37062 |
| 2000 | 2.37693 |
| 1999 | 2.38548 |
| 1998 | 2.40222 |
| 1997 | 2.42583 |
| 1996 | 2.4535 |
| 1995 | 2.48248 |
| 1994 | 2.51061 |
| 1993 | 2.53612 |
| 1992 | 2.55859 |
| 1991 | 2.58057 |
| 1990 | 2.60145 |
| 1989 | 2.62156 |
| 1988 | 2.64004 |
| 1987 | 2.65775 |
| 1986 | 2.67667 |
| 1985 | 2.69731 |
| 1984 | 2.71826 |
| 1983 | 2.73852 |
| 1982 | 2.75793 |
| 1981 | 2.77604 |
| 1980 | 2.79275 |
| 1979 | 2.80854 |
| 1978 | 2.82405 |
| 1977 | 2.83905 |
| 1976 | 2.85338 |
| 1975 | 2.86715 |
| 1974 | 2.88056 |
| 1973 | 2.89321 |
| 1972 | 2.90487 |
| 1971 | 2.91618 |
| 1970 | 2.92709 |
| 1969 | 2.93761 |
| 1968 | 2.94771 |
| 1967 | 2.9572 |
| 1966 | 2.96547 |
| 1965 | 2.97163 |
| 1964 | 2.97566 |
| 1963 | 2.97719 |
| 1962 | 2.97567 |
| 1961 | 2.97169 |
| 1960 | 2.9654 |