| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 126.845 |
| 2021 | 110.72 |
| 2020 | 102.187 |
| 2019 | 97.9002 |
| 2018 | 97.4058 |
| 2017 | 97.3501 |
| 2016 | 100 |
| 2015 | 89.3616 |
| 2014 | 86.148 |
| 2013 | 78.5993 |
| 2012 | 77.4133 |
| 2011 | 75.1499 |
| 2010 | 66.709 |
| 2009 | 61.9494 |
| 2008 | 53.818 |
| 2007 | 49.2061 |
| 2006 | 46.4081 |
| 2005 | 44.1333 |
| 2004 | 38.22 |
| 2003 | 34.7206 |
| 2002 | 33.6247 |
| 2001 | 33.2301 |
| 2000 | 30.6798 |
| 1999 | 26.8718 |
| 1998 | 23.5232 |
| 1997 | 21.3911 |
| 1996 | 20.3743 |
| 1995 | 17.5471 |
| 1994 | 16.3754 |
| 1993 | 14.9596 |
| 1992 | 13.231 |
| 1991 | 12.4073 |
| 1990 | 11.7965 |
| 1989 | 11.0974 |
| 1988 | 9.7646 |
| 1987 | 7.9583 |
| 1986 | 7.06186 |
| 1985 | 6.19129 |
| 1984 | 5.03793 |
| 1983 | 4.3646 |
| 1982 | 4.01359 |
| 1981 | 3.87056 |
| 1980 | 3.87398 |
| 1979 | 3.51572 |
| 1978 | 2.88513 |
| 1977 | 2.56532 |
| 1976 | 2.44462 |
| 1975 | 2.19612 |
| 1974 | 1.88561 |
| 1973 | 1.67168 |
| 1972 | 1.521 |
| 1971 | 1.37305 |
| 1970 | 1.31186 |
| 1969 | 1.23786 |
| 1968 | 1.21855 |
| 1967 | 1.19272 |
| 1966 | 1.10866 |
| 1965 | 1.048 |
| 1964 | 1.00918 |
| 1963 | 0.98411 |
| 1962 | 0.972664 |
| 1961 | 0.959606 |
| 1960 | 0.9414 |