| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 3.63195 |
| 2021 | 3.56388 |
| 2020 | 3.50276 |
| 2019 | 3.4333 |
| 2018 | 3.35768 |
| 2017 | 3.27413 |
| 2016 | 3.19022 |
| 2015 | 3.11438 |
| 2014 | 3.05114 |
| 2013 | 3.00179 |
| 2012 | 2.96345 |
| 2011 | 2.92693 |
| 2010 | 2.88162 |
| 2009 | 2.82855 |
| 2008 | 2.77155 |
| 2007 | 2.71228 |
| 2006 | 2.65545 |
| 2005 | 2.60568 |
| 2004 | 2.55983 |
| 2003 | 2.48956 |
| 2002 | 2.39901 |
| 2001 | 2.31753 |
| 2000 | 2.24449 |
| 1999 | 2.18126 |
| 1998 | 2.16365 |
| 1997 | 2.18939 |
| 1996 | 2.22108 |
| 1995 | 2.25989 |
| 1994 | 2.30733 |
| 1993 | 2.36062 |
| 1992 | 2.41631 |
| 1991 | 2.47157 |
| 1990 | 2.51949 |
| 1989 | 2.55726 |
| 1988 | 2.58703 |
| 1987 | 2.60857 |
| 1986 | 2.62179 |
| 1985 | 2.62769 |
| 1984 | 2.6245 |
| 1983 | 2.60817 |
| 1982 | 2.58724 |
| 1981 | 2.5774 |
| 1980 | 2.5889 |
| 1979 | 2.62708 |
| 1978 | 2.70103 |
| 1977 | 2.80243 |
| 1976 | 2.89233 |
| 1975 | 2.93592 |
| 1974 | 2.92884 |
| 1973 | 2.86621 |
| 1972 | 2.75422 |
| 1971 | 2.6429 |
| 1970 | 2.55498 |
| 1969 | 2.47609 |
| 1968 | 2.40727 |
| 1967 | 2.35736 |
| 1966 | 2.32344 |
| 1965 | 2.30239 |
| 1964 | 2.29871 |
| 1963 | 2.31548 |
| 1962 | 2.34934 |
| 1961 | 2.39952 |
| 1960 | 2.46695 |