| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 3.95636 |
| 2021 | 3.91748 |
| 2020 | 3.88456 |
| 2019 | 3.84489 |
| 2018 | 3.79688 |
| 2017 | 3.73793 |
| 2016 | 3.67385 |
| 2015 | 3.6136 |
| 2014 | 3.56079 |
| 2013 | 3.51607 |
| 2012 | 3.47776 |
| 2011 | 3.43526 |
| 2010 | 3.37664 |
| 2009 | 3.30507 |
| 2008 | 3.22676 |
| 2007 | 3.14458 |
| 2006 | 3.06409 |
| 2005 | 2.98942 |
| 2004 | 2.91661 |
| 2003 | 2.81621 |
| 2002 | 2.69163 |
| 2001 | 2.58209 |
| 2000 | 2.48795 |
| 1999 | 2.40338 |
| 1998 | 2.36663 |
| 1997 | 2.37678 |
| 1996 | 2.39374 |
| 1995 | 2.41706 |
| 1994 | 2.44949 |
| 1993 | 2.49031 |
| 1992 | 2.53567 |
| 1991 | 2.58196 |
| 1990 | 2.6223 |
| 1989 | 2.65249 |
| 1988 | 2.67504 |
| 1987 | 2.68975 |
| 1986 | 2.69625 |
| 1985 | 2.6947 |
| 1984 | 2.68267 |
| 1983 | 2.65584 |
| 1982 | 2.62419 |
| 1981 | 2.61036 |
| 1980 | 2.62802 |
| 1979 | 2.67702 |
| 1978 | 2.76245 |
| 1977 | 2.87293 |
| 1976 | 2.96903 |
| 1975 | 3.01933 |
| 1974 | 3.02325 |
| 1973 | 2.97857 |
| 1972 | 2.8877 |
| 1971 | 2.78501 |
| 1970 | 2.69368 |
| 1969 | 2.60853 |
| 1968 | 2.52505 |
| 1967 | 2.45613 |
| 1966 | 2.40865 |
| 1965 | 2.38622 |
| 1964 | 2.39403 |
| 1963 | 2.43707 |
| 1962 | 2.51205 |
| 1961 | 2.60974 |
| 1960 | 2.7252 |