| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 8.42264 |
| 2021 | 8.43919 |
| 2020 | 8.50582 |
| 2019 | 8.65512 |
| 2018 | 8.85933 |
| 2017 | 9.09049 |
| 2016 | 9.32198 |
| 2015 | 9.52882 |
| 2014 | 9.71146 |
| 2013 | 9.89386 |
| 2012 | 10.1005 |
| 2011 | 10.3337 |
| 2010 | 10.565 |
| 2009 | 10.7639 |
| 2008 | 10.926 |
| 2007 | 11.0531 |
| 2006 | 11.1424 |
| 2005 | 11.1851 |
| 2004 | 11.1764 |
| 2003 | 11.111 |
| 2002 | 10.9838 |
| 2001 | 10.8296 |
| 2000 | 10.6641 |
| 1999 | 10.4672 |
| 1998 | 10.2456 |
| 1997 | 10.0107 |
| 1996 | 9.78691 |
| 1995 | 9.60946 |
| 1994 | 9.49845 |
| 1993 | 9.45212 |
| 1992 | 9.45939 |
| 1991 | 9.46996 |
| 1990 | 9.46244 |
| 1989 | 9.4524 |
| 1988 | 9.43122 |
| 1987 | 9.39688 |
| 1986 | 9.35794 |
| 1985 | 9.32135 |
| 1984 | 9.29392 |
| 1983 | 9.28182 |
| 1982 | 9.28342 |
| 1981 | 9.28214 |
| 1980 | 9.25291 |
| 1979 | 9.19128 |
| 1978 | 9.10525 |
| 1977 | 8.99924 |
| 1976 | 8.88708 |
| 1975 | 8.78284 |
| 1974 | 8.67472 |
| 1973 | 8.45143 |
| 1972 | 8.1224 |
| 1971 | 7.82339 |
| 1970 | 7.56208 |
| 1969 | 7.34413 |
| 1968 | 7.30193 |
| 1967 | 7.42469 |
| 1966 | 7.57262 |
| 1965 | 7.74031 |
| 1964 | 7.92978 |
| 1963 | 8.13934 |
| 1962 | 8.35702 |
| 1961 | 8.56127 |
| 1960 | 8.73144 |