| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 7.99565 |
| 2021 | 7.97364 |
| 2020 | 7.92865 |
| 2019 | 7.86327 |
| 2018 | 7.77184 |
| 2017 | 7.64107 |
| 2016 | 7.47147 |
| 2015 | 7.27502 |
| 2014 | 7.06166 |
| 2013 | 6.83745 |
| 2012 | 6.60961 |
| 2011 | 6.38963 |
| 2010 | 6.19652 |
| 2009 | 6.04549 |
| 2008 | 5.93506 |
| 2007 | 5.86172 |
| 2006 | 5.81864 |
| 2005 | 5.79596 |
| 2004 | 5.77911 |
| 2003 | 5.75564 |
| 2002 | 5.7243 |
| 2001 | 5.66818 |
| 2000 | 5.5853 |
| 1999 | 5.49598 |
| 1998 | 5.40634 |
| 1997 | 5.3179 |
| 1996 | 5.2227 |
| 1995 | 5.11611 |
| 1994 | 4.9997 |
| 1993 | 4.86845 |
| 1992 | 4.72764 |
| 1991 | 4.61037 |
| 1990 | 4.52345 |
| 1989 | 4.44351 |
| 1988 | 4.31532 |
| 1987 | 4.14658 |
| 1986 | 4.00265 |
| 1985 | 3.88371 |
| 1984 | 3.79163 |
| 1983 | 3.79733 |
| 1982 | 3.8975 |
| 1981 | 3.97239 |
| 1980 | 4.00124 |
| 1979 | 4.02305 |
| 1978 | 4.05469 |
| 1977 | 4.09793 |
| 1976 | 4.14176 |
| 1975 | 4.17345 |
| 1974 | 4.19075 |
| 1973 | 4.19571 |
| 1972 | 4.21019 |
| 1971 | 4.28496 |
| 1970 | 4.39972 |
| 1969 | 4.48735 |
| 1968 | 4.52762 |
| 1967 | 4.54358 |
| 1966 | 4.58207 |
| 1965 | 4.67247 |
| 1964 | 4.81007 |
| 1963 | 5.00221 |
| 1962 | 5.22995 |
| 1961 | 5.42007 |
| 1960 | 5.51713 |