| 年份 | 加纳 |
|---|---|
| 2023 | - |
| 2022 | 0.428164 |
| 2021 | 0.505342 |
| 2020 | 0.572246 |
| 2019 | 0.605518 |
| 2018 | 0.647502 |
| 2017 | 0.770153 |
| 2016 | 0.884854 |
| 2015 | 0.922001 |
| 2014 | 0.977424 |
| 2013 | 1.03402 |
| 2012 | 1.0538 |
| 2011 | 1.04684 |
| 2010 | 1.09575 |
| 2009 | 1.18383 |
| 2008 | 1.23479 |
| 2007 | 1.2875 |
| 2006 | 1.34025 |
| 2005 | 1.38138 |
| 2004 | 1.40468 |
| 2003 | 1.47147 |
| 2002 | 1.52429 |
| 2001 | 1.45405 |
| 2000 | 1.1966 |
| 1999 | 1.0999 |
| 1998 | 1.09758 |
| 1997 | 1.05774 |
| 1996 | 1.02562 |
| 1995 | 1.06368 |
| 1994 | 1.13529 |
| 1993 | 1.24826 |
| 1992 | 1.30479 |
| 1991 | 1.3808 |
| 1990 | 1.45776 |
| 1989 | 1.456 |
| 1988 | 1.40253 |
| 1987 | 1.33542 |
| 1986 | 1.27763 |
| 1985 | 1.2706 |
| 1984 | 2.18264 |
| 1983 | 2.78846 |
| 1982 | 2.67068 |
| 1981 | 2.56101 |
| 1980 | 2.66412 |
| 1979 | 2.78455 |
| 1978 | 2.75223 |
| 1977 | 2.64827 |
| 1976 | 2.57155 |
| 1975 | 2.57626 |
| 1974 | 2.57036 |
| 1973 | 2.54571 |
| 1972 | 2.47487 |
| 1971 | 2.44439 |
| 1970 | 1.97292 |
| 1969 | 1.63036 |
| 1968 | 1.59312 |
| 1967 | 1.60114 |
| 1966 | 1.62251 |
| 1965 | 1.64479 |
| 1964 | 1.64428 |
| 1963 | 1.65551 |
| 1962 | 1.66191 |
| 1961 | 2.10509 |
| 1960 | - |