| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 4.10383 |
| 2021 | 10.0542 |
| 2020 | -10.4026 |
| 2019 | 1.04167 |
| 2018 | 2.08135 |
| 2017 | 1.97194 |
| 2016 | 5.05137 |
| 2015 | -6.7003 |
| 2014 | 3.67952 |
| 2013 | 9.00566 |
| 2012 | -2.07017 |
| 2011 | 4.71717 |
| 2010 | 7.87587 |
| 2009 | -15.8906 |
| 2008 | 1.17692 |
| 2007 | 3.73407 |
| 2006 | 6.347 |
| 2005 | 2.69388 |
| 2004 | 0.925706 |
| 2003 | 2.80852 |
| 2002 | 4.10783 |
| 2001 | -1.73773 |
| 2000 | -0.104458 |
| 1999 | 7.34243 |
| 1998 | -1.76122 |
| 1997 | 5.83842 |
| 1996 | 3.25223 |
| 1995 | 4.2507 |
| 1994 | 0.78266 |
| 1993 | -0.981012 |
| 1992 | 0.011375 |
| 1991 | 4.41456 |
| 1990 | 3.60476 |
| 1989 | 9.55046 |
| 1988 | 15.5755 |
| 1987 | 8.11409 |
| 1986 | 4.45248 |
| 1985 | 3.40605 |
| 1984 | 4.74807 |
| 1983 | 9.12442 |
| 1982 | 7.75109 |
| 1981 | 4.163 |
| 1980 | 6.6084 |
| 1979 | 6.61258 |
| 1978 | 8.62204 |
| 1977 | 6.38429 |
| 1976 | 5.09006 |
| 1975 | 3.02923 |
| 1974 | 3.39809 |
| 1973 | 15.6473 |
| 1972 | 21.8322 |
| 1971 | 23.3438 |
| 1970 | 16.0312 |
| 1969 | 14.3225 |
| 1968 | 9.8209 |
| 1967 | 5.21659 |
| 1966 | 5.62625 |
| 1965 | 4.20147 |
| 1964 | 4.31803 |
| 1963 | 3.48774 |
| 1962 | 4.27554 |
| 1961 | 4.0035 |
| 1960 | - |