| 年份 | 加纳 |
|---|---|
| 2023 | - |
| 2022 | 0.369123 |
| 2021 | 0.377291 |
| 2020 | 0.386146 |
| 2019 | 0.390996 |
| 2018 | 0.391748 |
| 2017 | 0.391878 |
| 2016 | 0.391604 |
| 2015 | 0.39096 |
| 2014 | 0.388524 |
| 2013 | 0.383924 |
| 2012 | 0.37889 |
| 2011 | 0.373539 |
| 2010 | 0.367845 |
| 2009 | 0.361972 |
| 2008 | 0.35506 |
| 2007 | 0.347232 |
| 2006 | 0.339119 |
| 2005 | 0.331061 |
| 2004 | 0.323202 |
| 2003 | 0.315493 |
| 2002 | 0.307057 |
| 2001 | 0.296899 |
| 2000 | 0.285915 |
| 1999 | 0.275476 |
| 1998 | 0.266169 |
| 1997 | 0.257828 |
| 1996 | 0.249497 |
| 1995 | 0.240755 |
| 1994 | 0.233156 |
| 1993 | 0.226939 |
| 1992 | 0.221387 |
| 1991 | 0.216484 |
| 1990 | 0.211352 |
| 1989 | 0.206806 |
| 1988 | 0.204521 |
| 1987 | 0.203853 |
| 1986 | 0.204517 |
| 1985 | 0.208054 |
| 1984 | 0.215397 |
| 1983 | 0.227643 |
| 1982 | 0.24417 |
| 1981 | 0.281577 |
| 1980 | 0.348292 |
| 1979 | 0.3848 |
| 1978 | 0.381363 |
| 1977 | 0.382373 |
| 1976 | 0.391572 |
| 1975 | 0.409962 |
| 1974 | 0.436889 |
| 1973 | 0.471357 |
| 1972 | 0.514289 |
| 1971 | 0.56981 |
| 1970 | 0.616452 |
| 1969 | 0.63565 |
| 1968 | 0.638034 |
| 1967 | 0.632362 |
| 1966 | 0.622308 |
| 1965 | 0.605832 |
| 1964 | 0.581378 |
| 1963 | 0.548284 |
| 1962 | 0.507321 |
| 1961 | 0.459843 |
| 1960 | 0.443039 |