| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 1.60476 |
| 2021 | 1.63674 |
| 2020 | 1.85099 |
| 2019 | 1.95086 |
| 2018 | 2.04279 |
| 2017 | 2.07922 |
| 2016 | 2.0288 |
| 2015 | 1.96237 |
| 2014 | 1.92509 |
| 2013 | 1.90563 |
| 2012 | 1.92086 |
| 2011 | 2.00556 |
| 2010 | 2.06095 |
| 2009 | 2.05499 |
| 2008 | 2.03027 |
| 2007 | 1.96496 |
| 2006 | 1.87874 |
| 2005 | 1.79765 |
| 2004 | 1.74841 |
| 2003 | 1.75228 |
| 2002 | 1.86676 |
| 2001 | 2.00327 |
| 2000 | 2.07271 |
| 1999 | 2.14267 |
| 1998 | 2.2196 |
| 1997 | 2.32306 |
| 1996 | 2.46573 |
| 1995 | 2.63144 |
| 1994 | 2.78404 |
| 1993 | 2.88384 |
| 1992 | 2.86396 |
| 1991 | 2.87376 |
| 1990 | 3.01202 |
| 1989 | 3.15281 |
| 1988 | 3.2974 |
| 1987 | 3.4257 |
| 1986 | 3.49989 |
| 1985 | 3.53354 |
| 1984 | 3.56103 |
| 1983 | 3.61968 |
| 1982 | 4.01519 |
| 1981 | 4.59857 |
| 1980 | 4.92196 |
| 1979 | 5.06232 |
| 1978 | 5.12391 |
| 1977 | 5.15485 |
| 1976 | 5.15307 |
| 1975 | 5.1242 |
| 1974 | 5.09046 |
| 1973 | 4.77484 |
| 1972 | 3.65057 |
| 1971 | 1.98856 |
| 1970 | 0.934203 |
| 1969 | 0.698143 |
| 1968 | 0.677129 |
| 1967 | 0.670612 |
| 1966 | 0.677241 |
| 1965 | 1.53562 |
| 1964 | 2.38162 |
| 1963 | 2.32408 |
| 1962 | 2.26719 |
| 1961 | 2.22478 |
| 1960 | - |