| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 0.80597 |
| 2021 | 0.781578 |
| 2020 | 0.764856 |
| 2019 | 0.741363 |
| 2018 | 0.729847 |
| 2017 | 0.730161 |
| 2016 | 0.729941 |
| 2015 | 0.729467 |
| 2014 | 0.730097 |
| 2013 | 0.732986 |
| 2012 | 0.737662 |
| 2011 | 0.74254 |
| 2010 | 0.747008 |
| 2009 | 0.751584 |
| 2008 | 0.757036 |
| 2007 | 0.762682 |
| 2006 | 0.767542 |
| 2005 | 0.770136 |
| 2004 | 0.769147 |
| 2003 | 0.764384 |
| 2002 | 0.75806 |
| 2001 | 0.756369 |
| 2000 | 0.763002 |
| 1999 | 0.777393 |
| 1998 | 0.799784 |
| 1997 | 0.826611 |
| 1996 | 0.848308 |
| 1995 | 0.857511 |
| 1994 | 0.855121 |
| 1993 | 0.842368 |
| 1992 | 0.818532 |
| 1991 | 0.788953 |
| 1990 | 0.761701 |
| 1989 | 0.737087 |
| 1988 | 0.712448 |
| 1987 | 0.688918 |
| 1986 | 0.665471 |
| 1985 | 0.641173 |
| 1984 | 0.618236 |
| 1983 | 0.599834 |
| 1982 | 0.586194 |
| 1981 | 0.58022 |
| 1980 | 0.586237 |
| 1979 | 0.605702 |
| 1978 | 0.6412 |
| 1977 | 0.691537 |
| 1976 | 0.747139 |
| 1975 | 0.795271 |
| 1974 | 0.829264 |
| 1973 | 0.84405 |
| 1972 | 0.839044 |
| 1971 | 0.824024 |
| 1970 | 0.808828 |
| 1969 | 0.801915 |
| 1968 | 0.813399 |
| 1967 | 0.841479 |
| 1966 | 0.872213 |
| 1965 | 0.89321 |
| 1964 | 0.914782 |
| 1963 | 0.940814 |
| 1962 | 0.959682 |
| 1961 | 0.97361 |
| 1960 | 0.986046 |