| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 5.78792 |
| 2021 | 11.8704 |
| 2020 | -8.72875 |
| 2019 | 3.0322 |
| 2018 | 4.18809 |
| 2017 | 4.11436 |
| 2016 | 7.20442 |
| 2015 | -4.85134 |
| 2014 | 5.69478 |
| 2013 | 11.1028 |
| 2012 | -0.170901 |
| 2011 | 6.83853 |
| 2010 | 10.1222 |
| 2009 | -14.1442 |
| 2008 | 3.25207 |
| 2007 | 5.79256 |
| 2006 | 8.36387 |
| 2005 | 4.55665 |
| 2004 | 2.70582 |
| 2003 | 4.62589 |
| 2002 | 6.06953 |
| 2001 | 0.250574 |
| 2000 | 1.9877 |
| 1999 | 9.66724 |
| 1998 | 0.443664 |
| 1997 | 8.32589 |
| 1996 | 5.8298 |
| 1995 | 7.03041 |
| 1994 | 3.62792 |
| 1993 | 1.91611 |
| 1992 | 2.91707 |
| 1991 | 7.45871 |
| 1990 | 6.77282 |
| 1989 | 13.0594 |
| 1988 | 19.45 |
| 1987 | 11.8819 |
| 1986 | 8.17292 |
| 1985 | 7.12527 |
| 1984 | 8.54538 |
| 1983 | 13.1467 |
| 1982 | 12.1655 |
| 1981 | 9.06486 |
| 1980 | 11.9869 |
| 1979 | 12.1486 |
| 1978 | 14.3328 |
| 1977 | 12.012 |
| 1976 | 10.6474 |
| 1975 | 8.44625 |
| 1974 | 8.7978 |
| 1973 | 21.3032 |
| 1972 | 26.3619 |
| 1971 | 25.8211 |
| 1970 | 17.1203 |
| 1969 | 15.1234 |
| 1968 | 10.5671 |
| 1967 | 5.92456 |
| 1966 | 6.34402 |
| 1965 | 5.81395 |
| 1964 | 6.8323 |
| 1963 | 5.92105 |
| 1962 | 6.66667 |
| 1961 | 6.34328 |
| 1960 | - |