| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 8.75638 |
| 2021 | 8.77451 |
| 2020 | 8.84577 |
| 2019 | 9.0023 |
| 2018 | 9.21196 |
| 2017 | 9.44224 |
| 2016 | 9.66514 |
| 2015 | 9.85746 |
| 2014 | 10.0215 |
| 2013 | 10.1859 |
| 2012 | 10.3816 |
| 2011 | 10.6064 |
| 2010 | 10.8217 |
| 2009 | 10.9908 |
| 2008 | 11.1068 |
| 2007 | 11.1702 |
| 2006 | 11.1854 |
| 2005 | 11.1529 |
| 2004 | 11.073 |
| 2003 | 10.9459 |
| 2002 | 10.7664 |
| 2001 | 10.5684 |
| 2000 | 10.3692 |
| 1999 | 10.1497 |
| 1998 | 9.91555 |
| 1997 | 9.6761 |
| 1996 | 9.44702 |
| 1995 | 9.25725 |
| 1994 | 9.12785 |
| 1993 | 9.05768 |
| 1992 | 9.03589 |
| 1991 | 9.03169 |
| 1990 | 9.02946 |
| 1989 | 9.03025 |
| 1988 | 9.02407 |
| 1987 | 9.00704 |
| 1986 | 8.98916 |
| 1985 | 8.97933 |
| 1984 | 8.98142 |
| 1983 | 8.99975 |
| 1982 | 9.03295 |
| 1981 | 9.05055 |
| 1980 | 9.01176 |
| 1979 | 8.90271 |
| 1978 | 8.72358 |
| 1977 | 8.47502 |
| 1976 | 8.17056 |
| 1975 | 7.83225 |
| 1974 | 7.45919 |
| 1973 | 6.9331 |
| 1972 | 6.28726 |
| 1971 | 5.76545 |
| 1970 | 5.51262 |
| 1969 | 5.49993 |
| 1968 | 5.73819 |
| 1967 | 6.16037 |
| 1966 | 6.58646 |
| 1965 | 7.00603 |
| 1964 | 7.32684 |
| 1963 | 7.5687 |
| 1962 | 7.83419 |
| 1961 | 8.10417 |
| 1960 | 8.35696 |