| 年份 | 加纳 |
|---|---|
| 2023 | - |
| 2022 | 2.99798 |
| 2021 | 3.04309 |
| 2020 | 3.08041 |
| 2019 | 3.09962 |
| 2018 | 3.0949 |
| 2017 | 3.06491 |
| 2016 | 3.01252 |
| 2015 | 2.94005 |
| 2014 | 2.84936 |
| 2013 | 2.74702 |
| 2012 | 2.64022 |
| 2011 | 2.53325 |
| 2010 | 2.43091 |
| 2009 | 2.3334 |
| 2008 | 2.23704 |
| 2007 | 2.13958 |
| 2006 | 2.0469 |
| 2005 | 1.96935 |
| 2004 | 1.91026 |
| 2003 | 1.87994 |
| 2002 | 1.89556 |
| 2001 | 1.94865 |
| 2000 | 2.0134 |
| 1999 | 2.08593 |
| 1998 | 2.16497 |
| 1997 | 2.23228 |
| 1996 | 2.28404 |
| 1995 | 2.33257 |
| 1994 | 2.38184 |
| 1993 | 2.42206 |
| 1992 | 2.44654 |
| 1991 | 2.45907 |
| 1990 | 2.46093 |
| 1989 | 2.44505 |
| 1988 | 2.41477 |
| 1987 | 2.38481 |
| 1986 | 2.3556 |
| 1985 | 2.32464 |
| 1984 | 2.29389 |
| 1983 | 2.23579 |
| 1982 | 2.15924 |
| 1981 | 2.10579 |
| 1980 | 2.065 |
| 1979 | 2.02638 |
| 1978 | 1.99087 |
| 1977 | 1.94738 |
| 1976 | 1.91659 |
| 1975 | 1.89901 |
| 1974 | 1.87024 |
| 1973 | 1.84035 |
| 1972 | 1.81483 |
| 1971 | 1.80003 |
| 1970 | 1.78846 |
| 1969 | 1.77361 |
| 1968 | 1.76163 |
| 1967 | 1.75627 |
| 1966 | 1.75744 |
| 1965 | 1.75309 |
| 1964 | 1.74368 |
| 1963 | 1.73823 |
| 1962 | 1.73131 |
| 1961 | 1.71985 |
| 1960 | 1.71819 |