| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 27.776 |
| 2021 | 28.44 |
| 2020 | 29.123 |
| 2019 | 29.828 |
| 2018 | 30.554 |
| 2017 | 31.3 |
| 2016 | 32.067 |
| 2015 | 32.845 |
| 2014 | 33.632 |
| 2013 | 34.428 |
| 2012 | 35.232 |
| 2011 | 36.135 |
| 2010 | 37.588 |
| 2009 | 39.063 |
| 2008 | 40.556 |
| 2007 | 42.072 |
| 2006 | 43.6 |
| 2005 | 44.056 |
| 2004 | 44.512 |
| 2003 | 44.971 |
| 2002 | 45.43 |
| 2001 | 45.938 |
| 2000 | 46.781 |
| 1999 | 47.628 |
| 1998 | 48.475 |
| 1997 | 49.323 |
| 1996 | 50.17 |
| 1995 | 51.019 |
| 1994 | 51.867 |
| 1993 | 52.714 |
| 1992 | 53.557 |
| 1991 | 54.708 |
| 1990 | 58.067 |
| 1989 | 61.352 |
| 1988 | 64.533 |
| 1987 | 67.599 |
| 1986 | 70.517 |
| 1985 | 73.276 |
| 1984 | 75.861 |
| 1983 | 78.277 |
| 1982 | 80.511 |
| 1981 | 82.448 |
| 1980 | 83.521 |
| 1979 | 84.543 |
| 1978 | 85.511 |
| 1977 | 86.428 |
| 1976 | 87.295 |
| 1975 | 88.116 |
| 1974 | 88.89 |
| 1973 | 89.619 |
| 1972 | 90.305 |
| 1971 | 91.002 |
| 1970 | 92.166 |
| 1969 | 93.19 |
| 1968 | 94.088 |
| 1967 | 94.876 |
| 1966 | 95.563 |
| 1965 | 96.161 |
| 1964 | 96.682 |
| 1963 | 96.829 |
| 1962 | 96.866 |
| 1961 | 96.903 |
| 1960 | 96.94 |