| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 2.55624 |
| 2021 | 2.51811 |
| 2020 | 2.47221 |
| 2019 | 2.41011 |
| 2018 | 2.33908 |
| 2017 | 2.26059 |
| 2016 | 2.18189 |
| 2015 | 2.11382 |
| 2014 | 2.05594 |
| 2013 | 1.9888 |
| 2012 | 1.91347 |
| 2011 | 1.84654 |
| 2010 | 1.78049 |
| 2009 | 1.71611 |
| 2008 | 1.68218 |
| 2007 | 1.67948 |
| 2006 | 1.68432 |
| 2005 | 1.69672 |
| 2004 | 1.71684 |
| 2003 | 1.74437 |
| 2002 | 1.77674 |
| 2001 | 1.81029 |
| 2000 | 1.84069 |
| 1999 | 1.86553 |
| 1998 | 1.88675 |
| 1997 | 1.90371 |
| 1996 | 1.91569 |
| 1995 | 1.92269 |
| 1994 | 1.92198 |
| 1993 | 1.9085 |
| 1992 | 1.88757 |
| 1991 | 1.87091 |
| 1990 | 1.86735 |
| 1989 | 1.87925 |
| 1988 | 1.90862 |
| 1987 | 1.94924 |
| 1986 | 1.98067 |
| 1985 | 1.98873 |
| 1984 | 1.97598 |
| 1983 | 1.94375 |
| 1982 | 1.89078 |
| 1981 | 1.8385 |
| 1980 | 1.79628 |
| 1979 | 1.75193 |
| 1978 | 1.70483 |
| 1977 | 1.66362 |
| 1976 | 1.63386 |
| 1975 | 1.61911 |
| 1974 | 1.62299 |
| 1973 | 1.64909 |
| 1972 | 1.70227 |
| 1971 | 1.78629 |
| 1970 | 1.87605 |
| 1969 | 1.95762 |
| 1968 | 2.04806 |
| 1967 | 2.13944 |
| 1966 | 2.20606 |
| 1965 | 2.23469 |
| 1964 | 2.24448 |
| 1963 | 2.22946 |
| 1962 | 2.18359 |
| 1961 | 2.15228 |
| 1960 | 2.16411 |