| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 9.20368 |
| 2021 | 9.14886 |
| 2020 | 9.12154 |
| 2019 | 9.1306 |
| 2018 | 9.15682 |
| 2017 | 9.18874 |
| 2016 | 9.23546 |
| 2015 | 9.33328 |
| 2014 | 9.51303 |
| 2013 | 9.75758 |
| 2012 | 10.0318 |
| 2011 | 10.3019 |
| 2010 | 10.5405 |
| 2009 | 10.7426 |
| 2008 | 10.9321 |
| 2007 | 11.1401 |
| 2006 | 11.3731 |
| 2005 | 11.6042 |
| 2004 | 11.8011 |
| 2003 | 11.9581 |
| 2002 | 12.0804 |
| 2001 | 12.1763 |
| 2000 | 12.2462 |
| 1999 | 12.2844 |
| 1998 | 12.2818 |
| 1997 | 12.2266 |
| 1996 | 12.1179 |
| 1995 | 11.9706 |
| 1994 | 11.7982 |
| 1993 | 11.6038 |
| 1992 | 11.3943 |
| 1991 | 11.1698 |
| 1990 | 10.9637 |
| 1989 | 10.8191 |
| 1988 | 10.7392 |
| 1987 | 10.7226 |
| 1986 | 10.7536 |
| 1985 | 10.8061 |
| 1984 | 10.8574 |
| 1983 | 10.8956 |
| 1982 | 10.9136 |
| 1981 | 10.9263 |
| 1980 | 10.9368 |
| 1979 | 10.9405 |
| 1978 | 10.948 |
| 1977 | 10.958 |
| 1976 | 10.9493 |
| 1975 | 10.8966 |
| 1974 | 10.7999 |
| 1973 | 10.6667 |
| 1972 | 10.5084 |
| 1971 | 10.3596 |
| 1970 | 10.2385 |
| 1969 | 10.1191 |
| 1968 | 9.87516 |
| 1967 | 9.52438 |
| 1966 | 9.20541 |
| 1965 | 8.92392 |
| 1964 | 8.68684 |
| 1963 | 8.63641 |
| 1962 | 8.7704 |
| 1961 | 8.93414 |
| 1960 | 9.12158 |