| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 3.07805 |
| 2021 | 0.643981 |
| 2020 | 0.458369 |
| 2019 | 1.15034 |
| 2018 | 3.23451 |
| 2017 | -0.649939 |
| 2016 | 0.510912 |
| 2015 | 1.55151 |
| 2014 | 0.126879 |
| 2013 | 6.08805 |
| 2012 | 6.38947 |
| 2011 | 3.07482 |
| 2010 | 5.18385 |
| 2009 | 2.91837 |
| 2008 | 9.18807 |
| 2007 | 6.7292 |
| 2006 | 15.0659 |
| 2005 | 8.80192 |
| 2004 | 1.28929 |
| 2003 | -0.428187 |
| 2002 | 3.01211 |
| 2001 | -6.35721 |
| 2000 | -3.32433 |
| 1999 | -2.0814 |
| 1998 | -0.154237 |
| 1997 | 10.8456 |
| 1996 | 2.85882 |
| 1995 | 13.9037 |
| 1994 | -0.458477 |
| 1993 | -5.12597 |
| 1992 | -4.0693 |
| 1991 | 6.84901 |
| 1990 | 18.7661 |
| 1989 | 21.274 |
| 1988 | 5.44124 |
| 1987 | -3.18119 |
| 1986 | 3.24833 |
| 1985 | 13.173 |
| 1984 | 3.53076 |
| 1983 | -9.98614 |
| 1982 | -8.54269 |
| 1981 | -6.30757 |
| 1980 | -2.92778 |
| 1979 | 6.91317 |
| 1978 | 7.09344 |
| 1977 | 3.31576 |
| 1976 | 5.04545 |
| 1975 | - |
| 1974 | - |
| 1973 | - |
| 1972 | - |
| 1971 | - |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |