| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 2.75549 |
| 2021 | 2.69751 |
| 2020 | 2.64226 |
| 2019 | 2.58036 |
| 2018 | 2.5206 |
| 2017 | 2.46412 |
| 2016 | 2.41009 |
| 2015 | 2.35808 |
| 2014 | 2.30954 |
| 2013 | 2.26436 |
| 2012 | 2.22018 |
| 2011 | 2.17591 |
| 2010 | 2.12994 |
| 2009 | 2.08263 |
| 2008 | 2.01837 |
| 2007 | 1.94108 |
| 2006 | 1.87444 |
| 2005 | 1.81666 |
| 2004 | 1.76603 |
| 2003 | 1.74894 |
| 2002 | 1.76434 |
| 2001 | 1.78803 |
| 2000 | 1.81886 |
| 1999 | 1.85277 |
| 1998 | 1.89031 |
| 1997 | 1.92916 |
| 1996 | 1.96599 |
| 1995 | 1.99871 |
| 1994 | 2.0285 |
| 1993 | 2.05696 |
| 1992 | 2.0821 |
| 1991 | 2.09754 |
| 1990 | 2.10189 |
| 1989 | 2.09635 |
| 1988 | 2.0769 |
| 1987 | 2.05105 |
| 1986 | 2.03642 |
| 1985 | 2.04487 |
| 1984 | 2.07804 |
| 1983 | 2.13893 |
| 1982 | 2.2181 |
| 1981 | 2.28797 |
| 1980 | 2.32362 |
| 1979 | 2.3216 |
| 1978 | 2.28149 |
| 1977 | 2.20329 |
| 1976 | 2.11146 |
| 1975 | 2.0265 |
| 1974 | 1.94546 |
| 1973 | 1.86452 |
| 1972 | 1.79942 |
| 1971 | 1.76792 |
| 1970 | 1.75871 |
| 1969 | 1.75784 |
| 1968 | 1.77239 |
| 1967 | 1.80106 |
| 1966 | 1.84062 |
| 1965 | 1.88917 |
| 1964 | 1.95398 |
| 1963 | 2.04273 |
| 1962 | 2.13972 |
| 1961 | 2.21685 |
| 1960 | 2.25475 |