| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 27.6554 |
| 2021 | 31.5526 |
| 2020 | 36.1431 |
| 2019 | 31.6419 |
| 2018 | 29.0985 |
| 2017 | 28.8781 |
| 2016 | 28.4757 |
| 2015 | 31.6394 |
| 2014 | 29.2538 |
| 2013 | 31.0633 |
| 2012 | 31.8384 |
| 2011 | 28.3311 |
| 2010 | 30.7753 |
| 2009 | 35.9378 |
| 2008 | 30.4958 |
| 2007 | 27.9077 |
| 2006 | 27.72 |
| 2005 | 19.4007 |
| 2004 | 20.5323 |
| 2003 | 22.0087 |
| 2002 | 22.3791 |
| 2001 | 23.4866 |
| 2000 | 24.9027 |
| 1999 | 27.4109 |
| 1998 | 30.0692 |
| 1997 | 28.1823 |
| 1996 | 26.1938 |
| 1995 | 30.0544 |
| 1994 | 28.6237 |
| 1993 | 27.9967 |
| 1992 | 26.3578 |
| 1991 | 24.2286 |
| 1990 | 24.1366 |
| 1989 | 22.6642 |
| 1988 | 23.8895 |
| 1987 | 26.8965 |
| 1986 | 23.9673 |
| 1985 | 22.9826 |
| 1984 | 25.0116 |
| 1983 | 25.8467 |
| 1982 | 26.0514 |
| 1981 | 24.808 |
| 1980 | 21.3389 |
| 1979 | 19.4104 |
| 1978 | 21.1269 |
| 1977 | 23.1558 |
| 1976 | 21.391 |
| 1975 | 18.9796 |
| 1974 | 17.2157 |
| 1973 | 14.5176 |
| 1972 | 13.336 |
| 1971 | 16.3546 |
| 1970 | 18.7817 |
| 1969 | 20.7021 |
| 1968 | 23.6842 |
| 1967 | 25.8029 |
| 1966 | 26.2873 |
| 1965 | 25.6098 |
| 1964 | 23.5101 |
| 1963 | 22.2442 |
| 1962 | 20.9111 |
| 1961 | 19.4435 |
| 1960 | 18.1357 |