| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 51.1478 |
| 2021 | 51.8402 |
| 2020 | 52.4186 |
| 2019 | 52.9329 |
| 2018 | 53.3689 |
| 2017 | 53.8233 |
| 2016 | 54.2999 |
| 2015 | 54.7257 |
| 2014 | 55.0515 |
| 2013 | 55.3026 |
| 2012 | 55.5113 |
| 2011 | 55.7638 |
| 2010 | 56.2006 |
| 2009 | 56.8473 |
| 2008 | 57.6368 |
| 2007 | 58.4887 |
| 2006 | 59.3719 |
| 2005 | 60.3411 |
| 2004 | 61.4866 |
| 2003 | 62.8341 |
| 2002 | 64.3605 |
| 2001 | 65.9919 |
| 2000 | 67.7156 |
| 1999 | 69.5894 |
| 1998 | 71.6201 |
| 1997 | 73.8285 |
| 1996 | 76.1676 |
| 1995 | 78.4802 |
| 1994 | 80.6615 |
| 1993 | 82.7654 |
| 1992 | 84.8385 |
| 1991 | 86.7175 |
| 1990 | 88.2971 |
| 1989 | 89.604 |
| 1988 | 90.5847 |
| 1987 | 91.217 |
| 1986 | 91.5729 |
| 1985 | 91.8022 |
| 1984 | 91.9863 |
| 1983 | 92.113 |
| 1982 | 92.1609 |
| 1981 | 92.4883 |
| 1980 | 93.372 |
| 1979 | 94.585 |
| 1978 | 95.9777 |
| 1977 | 97.5034 |
| 1976 | 99.2093 |
| 1975 | 101.192 |
| 1974 | 103.504 |
| 1973 | 106.13 |
| 1972 | 108.665 |
| 1971 | 109.982 |
| 1970 | 109.476 |
| 1969 | 107.9 |
| 1968 | 105.984 |
| 1967 | 103.928 |
| 1966 | 101.832 |
| 1965 | 99.784 |
| 1964 | 98.2699 |
| 1963 | 96.6316 |
| 1962 | 94.3876 |
| 1961 | 92.1485 |
| 1960 | 89.8954 |