| 年份 | 加纳 |
|---|---|
| 2023 | - |
| 2022 | 3.07773 |
| 2021 | 5.07647 |
| 2020 | 0.513942 |
| 2019 | 6.50777 |
| 2018 | 6.20008 |
| 2017 | 8.12889 |
| 2016 | 3.37347 |
| 2015 | 2.12076 |
| 2014 | 2.85624 |
| 2013 | 7.31252 |
| 2012 | 9.29279 |
| 2011 | 14.0471 |
| 2010 | 7.89971 |
| 2009 | 4.84449 |
| 2008 | 9.1498 |
| 2007 | 4.34682 |
| 2006 | 6.39991 |
| 2005 | 5.9 |
| 2004 | 5.6 |
| 2003 | 5.2 |
| 2002 | 4.5 |
| 2001 | 4 |
| 2000 | 3.7 |
| 1999 | 4.4 |
| 1998 | 4.70039 |
| 1997 | 4.19636 |
| 1996 | 4.60246 |
| 1995 | 4.11242 |
| 1994 | 3.3 |
| 1993 | 4.85 |
| 1992 | 3.87942 |
| 1991 | 5.28183 |
| 1990 | 3.32882 |
| 1989 | 5.08587 |
| 1988 | 5.62817 |
| 1987 | 4.7949 |
| 1986 | 5.19916 |
| 1985 | 5.09162 |
| 1984 | 8.64757 |
| 1983 | -4.56374 |
| 1982 | -6.92365 |
| 1981 | -3.50307 |
| 1980 | 0.471696 |
| 1979 | -2.51494 |
| 1978 | 8.47594 |
| 1977 | 2.27411 |
| 1976 | -3.53018 |
| 1975 | -12.4316 |
| 1974 | 6.85252 |
| 1973 | 2.88458 |
| 1972 | -2.48766 |
| 1971 | 5.21612 |
| 1970 | 9.72347 |
| 1969 | 6.00618 |
| 1968 | 0.36886 |
| 1967 | 3.07536 |
| 1966 | -4.25829 |
| 1965 | 1.369 |
| 1964 | 2.20933 |
| 1963 | 4.40597 |
| 1962 | 4.10916 |
| 1961 | 3.42967 |
| 1960 | - |