| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 5.73246 |
| 2021 | 5.65806 |
| 2020 | 5.60736 |
| 2019 | 5.49323 |
| 2018 | 5.37898 |
| 2017 | 5.27798 |
| 2016 | 5.19171 |
| 2015 | 5.12131 |
| 2014 | 5.06361 |
| 2013 | 5.04261 |
| 2012 | 5.05512 |
| 2011 | 5.07002 |
| 2010 | 5.09146 |
| 2009 | 5.12641 |
| 2008 | 5.17533 |
| 2007 | 5.2336 |
| 2006 | 5.2957 |
| 2005 | 5.35661 |
| 2004 | 5.4141 |
| 2003 | 5.46854 |
| 2002 | 5.52079 |
| 2001 | 5.57538 |
| 2000 | 5.63313 |
| 1999 | 5.68859 |
| 1998 | 5.73621 |
| 1997 | 5.77947 |
| 1996 | 5.82545 |
| 1995 | 5.87546 |
| 1994 | 5.92788 |
| 1993 | 5.9875 |
| 1992 | 6.04287 |
| 1991 | 6.06231 |
| 1990 | 6.03671 |
| 1989 | 5.97896 |
| 1988 | 5.88872 |
| 1987 | 5.77416 |
| 1986 | 5.66028 |
| 1985 | 5.56837 |
| 1984 | 5.49928 |
| 1983 | 5.45573 |
| 1982 | 5.44125 |
| 1981 | 5.47593 |
| 1980 | 5.57711 |
| 1979 | 5.73288 |
| 1978 | 5.94259 |
| 1977 | 6.20281 |
| 1976 | 6.50569 |
| 1975 | 6.84973 |
| 1974 | 7.23891 |
| 1973 | 7.67727 |
| 1972 | 8.12747 |
| 1971 | 8.456 |
| 1970 | 8.54842 |
| 1969 | 8.46796 |
| 1968 | 8.31519 |
| 1967 | 8.13061 |
| 1966 | 7.96482 |
| 1965 | 7.84932 |
| 1964 | 7.86755 |
| 1963 | 7.99278 |
| 1962 | 8.11753 |
| 1961 | 8.22822 |
| 1960 | 8.29488 |