| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.242401 |
| 2020 | 0.0692368 |
| 2019 | 0.0539101 |
| 2018 | 0.0622408 |
| 2017 | 0.0638032 |
| 2016 | 0.0594005 |
| 2015 | 0.045897 |
| 2014 | 0.221228 |
| 2013 | 0.617 |
| 2012 | 1.35326 |
| 2011 | 1.20502 |
| 2010 | 1.33623 |
| 2009 | 1.56462 |
| 2008 | 2.74591 |
| 2007 | 6.72227 |
| 2006 | 5.87153 |
| 2005 | 1.80451 |
| 2004 | 2.6029 |
| 2003 | 1.41345 |
| 2002 | 0.370228 |
| 2001 | 0.602411 |
| 2000 | 1.93421 |
| 1999 | 0.935691 |
| 1998 | 0.180957 |
| 1997 | 0.728962 |
| 1996 | 0.490843 |
| 1995 | 1.44847 |
| 1994 | 0.943222 |
| 1993 | 0.515037 |
| 1992 | 1.20043 |
| 1991 | 2.28046 |
| 1990 | 1.19813 |
| 1989 | 4.75035 |
| 1988 | 6.40507 |
| 1987 | 0.211059 |
| 1986 | 0.00635896 |
| 1985 | 0.334786 |
| 1984 | 0.208943 |
| 1983 | 0.530854 |
| 1982 | 0.29052 |
| 1981 | 0.69248 |
| 1980 | 2.08674 |
| 1979 | 2.53819 |
| 1978 | 0.628314 |
| 1977 | 3.45621 |
| 1976 | 5.56298 |
| 1975 | 2.04995 |
| 1974 | 2.79543 |
| 1973 | 0.397735 |
| 1972 | - |
| 1971 | - |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |