| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 23.576 |
| 2020 | 24.195 |
| 2019 | 24.887 |
| 2018 | 25.328 |
| 2017 | 25.672 |
| 2016 | 26.13 |
| 2015 | 26.409 |
| 2014 | 26.771 |
| 2013 | 27.097 |
| 2012 | 27.407 |
| 2011 | 27.596 |
| 2010 | 27.898 |
| 2009 | 28.175 |
| 2008 | 28.406 |
| 2007 | 28.563 |
| 2006 | 28.635 |
| 2005 | 28.404 |
| 2004 | 28.141 |
| 2003 | 28.178 |
| 2002 | 28.477 |
| 2001 | 28.906 |
| 2000 | 28.961 |
| 1999 | 28.885 |
| 1998 | 28.971 |
| 1997 | 29.115 |
| 1996 | 29.865 |
| 1995 | 31.042 |
| 1994 | 32.248 |
| 1993 | 32.808 |
| 1992 | 33.172 |
| 1991 | 33.512 |
| 1990 | 34.35 |
| 1989 | 35.304 |
| 1988 | 36.524 |
| 1987 | 37.793 |
| 1986 | 39.015 |
| 1985 | 39.817 |
| 1984 | 40.588 |
| 1983 | 41.451 |
| 1982 | 42.536 |
| 1981 | 43.684 |
| 1980 | 44.499 |
| 1979 | 45.147 |
| 1978 | 45.689 |
| 1977 | 46.041 |
| 1976 | 46.425 |
| 1975 | 46.383 |
| 1974 | 46.293 |
| 1973 | 46.126 |
| 1972 | 45.978 |
| 1971 | 45.764 |
| 1970 | 45.698 |
| 1969 | 45.633 |
| 1968 | 45.693 |
| 1967 | 45.713 |
| 1966 | 45.849 |
| 1965 | 45.942 |
| 1964 | 46.24 |
| 1963 | 46.186 |
| 1962 | 46.094 |
| 1961 | 46.586 |
| 1960 | 47.09 |