| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 9.6181 |
| 2021 | 9.55726 |
| 2020 | 9.52998 |
| 2019 | 9.54604 |
| 2018 | 9.58969 |
| 2017 | 9.64215 |
| 2016 | 9.70393 |
| 2015 | 9.8108 |
| 2014 | 9.9927 |
| 2013 | 10.2318 |
| 2012 | 10.4977 |
| 2011 | 10.7599 |
| 2010 | 10.9976 |
| 2009 | 11.206 |
| 2008 | 11.4054 |
| 2007 | 11.6267 |
| 2006 | 11.8664 |
| 2005 | 12.085 |
| 2004 | 12.247 |
| 2003 | 12.3488 |
| 2002 | 12.3953 |
| 2001 | 12.4115 |
| 2000 | 12.408 |
| 1999 | 12.3752 |
| 1998 | 12.3065 |
| 1997 | 12.1918 |
| 1996 | 12.0325 |
| 1995 | 11.8446 |
| 1994 | 11.6424 |
| 1993 | 11.434 |
| 1992 | 11.2214 |
| 1991 | 10.9933 |
| 1990 | 10.7822 |
| 1989 | 10.6354 |
| 1988 | 10.5572 |
| 1987 | 10.545 |
| 1986 | 10.583 |
| 1985 | 10.6437 |
| 1984 | 10.7037 |
| 1983 | 10.7506 |
| 1982 | 10.7809 |
| 1981 | 10.8321 |
| 1980 | 10.9257 |
| 1979 | 11.0396 |
| 1978 | 11.1591 |
| 1977 | 11.27 |
| 1976 | 11.3347 |
| 1975 | 11.3102 |
| 1974 | 11.1833 |
| 1973 | 10.953 |
| 1972 | 10.6009 |
| 1971 | 10.157 |
| 1970 | 9.83148 |
| 1969 | 9.68851 |
| 1968 | 9.47628 |
| 1967 | 9.19602 |
| 1966 | 9.00923 |
| 1965 | 8.90572 |
| 1964 | 8.74826 |
| 1963 | 8.67881 |
| 1962 | 8.8128 |
| 1961 | 8.98026 |
| 1960 | 9.18436 |