| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 2.5284 |
| 2021 | 2.59576 |
| 2020 | 2.85062 |
| 2019 | 2.99088 |
| 2018 | 3.12279 |
| 2017 | 3.20193 |
| 2016 | 3.18065 |
| 2015 | 3.14126 |
| 2014 | 3.13165 |
| 2013 | 3.13939 |
| 2012 | 3.32483 |
| 2011 | 4.30699 |
| 2010 | 4.45265 |
| 2009 | 4.53558 |
| 2008 | 4.61366 |
| 2007 | 4.63809 |
| 2006 | 2.69052 |
| 2005 | 2.6161 |
| 2004 | 2.5791 |
| 2003 | 2.58989 |
| 2002 | 2.80195 |
| 2001 | 3.57493 |
| 2000 | 3.67701 |
| 1999 | 3.77319 |
| 1998 | 3.87911 |
| 1997 | 4.00853 |
| 1996 | 4.18428 |
| 1995 | 4.37781 |
| 1994 | 4.55947 |
| 1993 | 4.68271 |
| 1992 | 5.37345 |
| 1991 | 10.5795 |
| 1990 | 11.1697 |
| 1989 | 11.7422 |
| 1988 | 12.3387 |
| 1987 | 12.8632 |
| 1986 | 13.3251 |
| 1985 | 13.7066 |
| 1984 | 14.1067 |
| 1983 | 14.4721 |
| 1982 | 14.4832 |
| 1981 | 10.907 |
| 1980 | 11.3245 |
| 1979 | 11.5291 |
| 1978 | 11.662 |
| 1977 | 11.7566 |
| 1976 | 11.8334 |
| 1975 | 11.8591 |
| 1974 | 11.8765 |
| 1973 | 11.6119 |
| 1972 | 11.1122 |
| 1971 | 15.8415 |
| 1970 | 14.9409 |
| 1969 | 14.8382 |
| 1968 | 14.9825 |
| 1967 | 15.0683 |
| 1966 | 15.1514 |
| 1965 | 16.1232 |
| 1964 | 6.91231 |
| 1963 | 3.49518 |
| 1962 | 3.4554 |
| 1961 | 3.42604 |
| 1960 | - |