| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 7.94471 |
| 2021 | 7.96601 |
| 2020 | 7.95619 |
| 2019 | 7.91386 |
| 2018 | 7.83457 |
| 2017 | 7.70631 |
| 2016 | 7.52855 |
| 2015 | 7.31495 |
| 2014 | 7.07803 |
| 2013 | 6.82691 |
| 2012 | 6.57553 |
| 2011 | 6.3423 |
| 2010 | 6.15278 |
| 2009 | 6.02202 |
| 2008 | 5.94707 |
| 2007 | 5.92057 |
| 2006 | 5.92668 |
| 2005 | 5.94586 |
| 2004 | 5.96224 |
| 2003 | 5.96803 |
| 2002 | 5.96026 |
| 2001 | 5.92721 |
| 2000 | 5.86827 |
| 1999 | 5.7992 |
| 1998 | 5.72322 |
| 1997 | 5.64026 |
| 1996 | 5.54254 |
| 1995 | 5.42412 |
| 1994 | 5.29052 |
| 1993 | 5.14585 |
| 1992 | 4.99275 |
| 1991 | 4.87694 |
| 1990 | 4.811 |
| 1989 | 4.75601 |
| 1988 | 4.65722 |
| 1987 | 4.51735 |
| 1986 | 4.39285 |
| 1985 | 4.28102 |
| 1984 | 4.18458 |
| 1983 | 4.1731 |
| 1982 | 4.24993 |
| 1981 | 4.31824 |
| 1980 | 4.36978 |
| 1979 | 4.43348 |
| 1978 | 4.51235 |
| 1977 | 4.60272 |
| 1976 | 4.69331 |
| 1975 | 4.77173 |
| 1974 | 4.8349 |
| 1973 | 4.88353 |
| 1972 | 4.91396 |
| 1971 | 4.92694 |
| 1970 | 4.93312 |
| 1969 | 4.92619 |
| 1968 | 4.88796 |
| 1967 | 4.83844 |
| 1966 | 4.82241 |
| 1965 | 4.8653 |
| 1964 | 4.95425 |
| 1963 | 5.09619 |
| 1962 | 5.27655 |
| 1961 | 5.42556 |
| 1960 | 5.49491 |