| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.295898 |
| 2020 | 0.329608 |
| 2019 | 0.275564 |
| 2018 | 0.293296 |
| 2017 | 0.40346 |
| 2016 | 0.423673 |
| 2015 | 0.451493 |
| 2014 | 0.393988 |
| 2013 | 0.401524 |
| 2012 | 0.396571 |
| 2011 | 0.320802 |
| 2010 | 0.338206 |
| 2009 | 0.460189 |
| 2008 | 0.451392 |
| 2007 | 0.36214 |
| 2006 | 0.284731 |
| 2005 | 0.270545 |
| 2004 | 0.274351 |
| 2003 | 0.396163 |
| 2002 | 0.373205 |
| 2001 | 0.309289 |
| 2000 | 0.303662 |
| 1999 | 0.321924 |
| 1998 | 0.50447 |
| 1997 | 0.469357 |
| 1996 | 0.524392 |
| 1995 | 0.549448 |
| 1994 | 0.435956 |
| 1993 | 0.392284 |
| 1992 | 0.431993 |
| 1991 | 0.442562 |
| 1990 | 0.474157 |
| 1989 | 0.455268 |
| 1988 | 0.517217 |
| 1987 | 0.653248 |
| 1986 | 0.932549 |
| 1985 | 0.763762 |
| 1984 | 0.869234 |
| 1983 | 1.01843 |
| 1982 | 1.72718 |
| 1981 | 1.21399 |
| 1980 | 1.41062 |
| 1979 | 1.51563 |
| 1978 | 2.10472 |
| 1977 | 2.65268 |
| 1976 | 1.89057 |
| 1975 | 2.13512 |
| 1974 | 1.83129 |
| 1973 | 2.02163 |
| 1972 | 1.87014 |
| 1971 | 2.10663 |
| 1970 | 3.15399 |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |